X

Guides

PC-configurator
Register Login
 EN   DA   SV
To gain full access to our webshop, find our entire product range and see our prices, you need to be logged in.
Log in to your account here or sign up as a customer here.
  1. Front page
  2. Components
  3. Cases
Show all options
Show all options
Show all options
Show all options

Kabinetter

(1313)
Inter-Tech IP-40 Ultralille formfaktor Mini ITX Sort

Inter-Tech IP-40 Ultralille formfaktor Mini ITX Sort

Inter-Tech TM-515 Tower Micro ATX Sort

Inter-Tech TM-515 Tower Micro ATX Sort

Inter-Tech IPC SC-4100 Ultralille formfaktor Mini ITX Sort

Inter-Tech IPC SC-4100 Ultralille formfaktor Mini ITX Sort

Supermicro SC733 TQ-668B Tower Udvidet ATX 668Watt Strømforsyning Sort

Supermicro SC733 TQ-668B Tower Udvidet ATX 668Watt Strømforsyning Sort

Inter-Tech IT-6521 Straight Tower Micro ATX Sort

Inter-Tech IT-6521 Straight micro-ATX Ingen strømforsyning Sort

Inter-Tech 4452-TFT Rackversion ATX Sort

Inter-Tech 4452-TFT Rackversion ATX Sort

Inter-Tech IT-2812 Business Tower ATX Sort

Inter-Tech IT-2812 Business Tower ATX Sort

NZXT H9 Flow (2025) All Black MidiTower Mesh CM-92FB-01 retail

NZXT H9 Flow 2025 Tårn ATX Ingen strømforsyning Sort

  • Product no 1003399054
  • Model CM-H92FB-01
  • Brand NZXT
  • EAN 5056547207643
Fractal Design Meshify 3 XL Tower Udvidet ATX Sort

Fractal Design Meshify 3 XL RGB TG Light Tint Tårn ATX Ingen Strømforsyning Sort

  • Product no 1003393753
  • Model FD-C-MES3X-04
  • Brand Fractal Design
  • EAN 7340172709527
AeroCool PGS V Series Bolt Tower ATX Sort

AeroCool PGS V Series Bolt Tower ATX Sort

  • Product no 994846645
  • Model AEROPGSBOLT-BK-RGB
  • Brand AeroCool
  • EAN 4718009156326
MSI MEG MAESTRO 700L PZ Tårn Udvidet ATX Ingen strømforsyning Sort

MSI MEG MAESTRO 700L PZ Tårn Udvidet ATX Ingen strømforsyning Sort

  • Product no 1002228726
  • Model 306-7G25L21-W57
  • Brand MSI
  • EAN 4711377144612
MSI MAG PANO 110R PZ Tower ATX Hvid

MSI MAG PANO 110R PZ Tower ATX Hvid

  • Product no 1003351684
  • Model MAG PANO 110R PZ WHI
  • Brand MSI
  • EAN 4711377293198
Fractal Design Meshify 3 XL Ambience Pro RGB Tower Udvidet ATX Sort

Fractal Design Meshify 3 XL Ambience Pro RGB Light Tint Tårn ATX Ingen Strømforsyning Sort

  • Product no 1002943154
  • Model FD-C-MES3X-03
  • Brand Fractal Design
  • EAN 7340172707233
Fractal Design Terra Ultralille formfaktor Mini ITX Strømforsyning Brun Sølv

Fractal Design Terra Ultralille formfaktor Mini ITX Strømforsyning Brun Sølv

  • Product no 1001027342
  • Model FD-C-TER1N-02
  • Brand Fractal Design
  • EAN 7340172703990
CORSAIR 9000D RGB AIRFLOW Tower SSI EEB Hvid

CORSAIR 9000D RGB AIRFLOW Tower SSI EEB Hvid

  • Product no 1002297296
  • Model CC-9011274-WW
  • Brand Corsair
  • EAN 0840006682189
HYTE X50 Tower Udvidet ATX Rød

HYTE X50 Tower Udvidet ATX Rød

  • Product no 1003588815
  • Model CS-HYTE-X50G-RR
  • Brand Hyte
  • EAN 1220000352551
DeepCool CH690 DIGITAL Tower ATX Sort

DeepCool CH690 Digital Tårn ATX Inten Strømforsyning Sort

Cooler Master Elite 300 Tower Micro ATX Sort

Cooler Master Elite 300 Tower Micro ATX Sort

  • Product no 1000934725
  • Model E300-KN5N-S00
  • Brand Cooler Master
  • EAN 4719512130872
Sharkoon M30 RGB Tower Udvidet ATX Sort

Sharkoon M30 RGB Tower Udvidet ATX Sort

  • Product no 1000963520
  • Model 4044951037940
  • Brand Sharkoon
  • EAN 4044951037940
Sharkoon RGB Hex Tower ATX Sort

Sharkoon RGB Hex Tower ATX Sort

  • Product no 1000968558
  • Model 4044951037551
  • Brand Sharkoon
  • EAN 4044951037551
AeroCool Cylon Pro Tower ATX Hvid

AeroCool Cylon Pro Tower ATX Hvid

  • Product no 995291260
  • Model ACCM-PB10012.21
  • Brand AeroCool
  • EAN 4718009158924
Thermaltake H Series H590 TG Snow ARGB Tårn Udvidet ATX Ingen strømforsyning Hvid

Thermaltake H Series H590 TG Snow ARGB Tårn Udvidet ATX Ingen strømforsyning Hvid

Cooler Master MasterBox TD300 MESH Tower Micro ATX Sort

Cooler Master MasterBox TD300 MESH Tower Micro ATX Sort

  • Product no 1000264098
  • Model TD300-KGNN-S00
  • Brand Cooler Master
  • EAN 4719512124154
Thermaltake View 300 MX Snow Tower Udvidet ATX Hvid

Thermaltake View 300 MX Snow Tower Udvidet ATX Hvid

Geh AZZA Fulltower ATX Storm 6000B ARGB(Win-Glas,4xRGB)2xUSB

Geh AZZA Fulltower ATX Storm 6000B ARGB(Win-Glas,4xRGB)2xUSB

  • Product no 1001015179
  • Model CSAZ-6000ARGB/B
  • Brand AZZA
  • EAN 4712839556271
Inter-Tech IPC 6U-6606 Rackversion Udvidet ATX Sort

Inter-Tech IPC 6U-6606 Rackversion Udvidet ATX Sort

Endorfy Ventum 200 Air Tower ATX Sort

Endorfy Ventum 200 Air Tower ATX Sort

  • Product no 1000868587
  • Model EY2A002
  • Brand Endorfy
  • EAN 5903018666211
SilverStone RM52 Rackversion SSI EEB Sort

SilverStone RM52 Rackversion SSI EEB Sort

Logic ARAMIS ARGB MINIDI USB 3.0 Case Black

Logic ARAMIS ARGB MINIDI USB 3.0 Case Black

  • Product no 1001656532
  • Model AT-ARAMIS-10-0000000
  • Brand Logic
  • EAN 5905842126008
Sharkoon REV300 Tower Udvidet ATX Hvid

Sharkoon REV300 Tower Udvidet ATX Hvid

  • Product no 1001663131
  • Model 4044951039593
  • Brand Sharkoon
  • EAN 4044951039593
be quiet! SHADOW BASE 800 DX Tower Udvidet ATX Hvid

be quiet! SHADOW BASE 800 DX Tower Udvidet ATX Hvid

  • Product no 1001519276
  • Model BGW62
  • Brand Listan
  • EAN 4260052190623
be quiet! Tower Udvidet ATX Sort

be quiet! Tower Udvidet ATX Sort

  • Product no 1001519274
  • Model BGW60
  • Brand Listan
  • EAN 4260052190609
LC Power Gaming 807W Stormwatch_X Tower Udvidet ATX Hvid

LC Power Gaming 807W Stormwatch_X Tower Udvidet ATX Hvid

  • Product no 1001519268
  • Model LC-807W-ON
  • Brand LC Power
  • EAN 4260070129438
XPG Invader X Tårn ATX Ingen strømforsyning Sort

XPG Invader X Tårn ATX Ingen strømforsyning Sort

Sharkoon VS9 Tower ATX Sort

Sharkoon VS9 Tower ATX Sort

  • Product no 1001516538
  • Model 4044951039111
  • Brand Sharkoon
  • EAN 4044951039111
Sharkoon VS9 Tower ATX Hvid

Sharkoon VS9 Tower ATX Hvid

  • Product no 1001516539
  • Model 4044951039128
  • Brand Sharkoon
  • EAN 4044951039128
Jonsbo C6 mATX Gehäuse

Jonsbo C6 Tårn Mini ITX / micro ATX Ingen strømforsyning Hvid

  • Product no 1001393561
  • Model C6 White
  • Brand Jonsbo
  • EAN 6970620552712
DeepCool CH560 WH Tower Udvidet ATX Hvid

DeepCool CH560 WH Tower Udvidet ATX Hvid

Montech AIR 1000 Silent Tårn ATX Ingen strømforsyning Sort

Montech AIR 1000 Silent Tårn ATX Ingen strømforsyning Sort

  • Product no 1001581979
  • Model AIR 1000 SILENT BK
  • Brand Montech
  • EAN 4710562748864
Montech AIR 100 ARGB Tower Micro ATX Sort

Montech AIR 100 ARGB Tower Micro ATX Sort

  • Product no 1001581975
  • Model AIR 100 ARGB BK
  • Brand Montech
  • EAN 4710562748086
Phanteks Enthoo Pro 2 Tårn Udvidet ATX Ingen strømforsyning Sort

Phanteks Enthoo Pro 2 Tårn Udvidet ATX Ingen strømforsyning Sort

  • Product no 1001602624
  • Model PH-ES620PC_BK02
  • Brand Phanteks
  • EAN 0886523302742
New--Air 903 Base

Montech Air 903 BASE Midi Tower Sort

  • Product no 1001604065
  • Model AIR 903 BASE (B)
  • Brand Montech
  • EAN 4710562743784
MSI MAG PANO M100R PZ Tower Micro ATX Hvid

MSI MAG PANO M100R PZ Tower Micro ATX Hvid

  • Product no 1001830112
  • Model 306-7G24W21-809
  • Brand MSI
  • EAN 4711377136488
Endorfy Arx 700 Air Tower ATX Sort

Endorfy Arx 700 Air Tower ATX Sort

  • Product no 1001153130
  • Model EY2A012
  • Brand Endorfy
  • EAN 5903018666310
Sharkoon Rebel C50 Tower ATX Sort

Sharkoon Rebel C50 Tower ATX Sort

  • Product no 1001152613
  • Model 4044951038220
  • Brand Sharkoon
  • EAN 4044951038220
MSI MPG VELOX 100R Tower ATX Hvid

MSI MPG VELOX 100R Tower ATX Hvid

  • Product no 1001306447
  • Model 306-7G18W23-809
  • Brand MSI
  • EAN 4719072970239
Thermaltake Ceres 300 TG ARGB Snow Tower Udvidet ATX Hvid

Thermaltake Ceres 300 TG ARGB Snow Tower Udvidet ATX Hvid

SilverStone RM51 Rackversion SSI EEB Sort

SilverStone RM51 Rackversion SSI EEB Sort

Phanteks NV7 Tower Udvidet ATX Hvid

Phanteks NV7 Tower Udvidet ATX Hvid

  • Product no 1001113148
  • Model PH-NV723TG_DMW01
  • Brand Phanteks
  • EAN 0886523302797
Jonsbo D31 MESH mATX Gehäuse, Tempered Glass

Jonsbo D31 mesh Hvid Kabinet Minitower

  • Product no 1001111717
  • Model D31 MESH WHITE
  • Brand Jonsbo
  • EAN 6970620552484
Jonsbo D31 mATX Gehäuse, Tempered Glass

Jonsbo D31 STD Midi Tower Hvid

  • Product no 1001111721
  • Model D31 STD WHITE
  • Brand Jonsbo
  • EAN 6970620552460
Kolink Observatory HF Mesh Core Midi Tower Case

Kolink Observatory HF Mesh Core Midi Tower Case

Sharkoon VK2 RGB Tower ATX Sort

Sharkoon VK2 RGB Tower ATX Sort

  • Product no 1002330510
  • Model 4044951041206
  • Brand Sharkoon
  • EAN 4044951041206
Thermaltake The Tower 600 Tower ATX Blå

Thermaltake The Tower 600 Tower ATX Blå

Jonsbo N4 NAS-Gehäuse

Jonsbo N4 WHITE computeretui Micro Tower Hvid

  • Product no 1002328756
  • Model N4 WHITE
  • Brand Jonsbo
  • EAN 6970620553771
DeepCool CH360 Tower Micro ATX Sort

DeepCool CH360 Tower Micro ATX Sort

HYTE Y40 Tower ATX Sort Hvid

HYTE Y40 Tower ATX Sort Hvid

  • Product no 1001885977
  • Model CS-HYTE-Y40-BW
  • Brand Hyte
  • EAN 1220000350311
Ceres 350 MX Snow White

Thermaltake Ceres 350 MX Midi Tower Hvid

Montech SKY TWO GX Tower Udvidet ATX Hvid

Montech SKY TWO GX Tower Udvidet ATX Hvid

  • Product no 1002275593
  • Model SKY TWO GX (W)
  • Brand Montech
  • EAN 4710562747768
Phanteks XT Pro Ultra Tower Udvidet ATX Hvid

Phanteks XT Pro Ultra Tower Udvidet ATX Hvid

  • Product no 1001920920
  • Model PH-XT523P1_DWT01
  • Brand Phanteks
  • EAN 0886523303145
Cooler Master MasterBox 600 Tower Udvidet ATX Hvid

Cooler Master MasterBox 600 Tower Udvidet ATX Hvid

  • Product no 1001915333
  • Model MB600-WGNN-S00
  • Brand Cooler Master
  • EAN 4719512146903
Thermaltake CTE E600 MX Snow Tower Udvidet ATX Hvid

Thermaltake CTE E600 MX Snow Tower Udvidet ATX Hvid

HYTE Y60 Tower Udvidet ATX Sort

HYTE Y60 Tower Udvidet ATX Sort

  • Product no 1001886378
  • Model CS-HYTE-Y60-B
  • Brand Hyte
  • EAN 1220000350090
Hyte Y40 Midi-Tower, Tempered Glass

HYTE Y40 Tårn ATX Ingen strømforsyning Snow White

  • Product no 1001886377
  • Model CS-HYTE-Y40-WW
  • Brand Hyte
  • EAN 1220000350502
Kolink Observatory MX Glass ARGB Midi Tower Case

Kolink OBSERVATORY MX Midi Tower Hvid

Sharkoon Rebel C70M Tower ATX Sort Brun

Sharkoon Rebel C70M Tower ATX Sort Brun

  • Product no 1001826445
  • Model 4044951040179
  • Brand Sharkoon
  • EAN 4044951040179
warehouse linden----SKY TWO (blau, Tempered Glass x 2)

Montech SKY TWO Midi Tower Blå

  • Product no 1002154684
  • Model SKYTWOM
  • Brand Montech
  • EAN 4710562747652
Aerocool PGS Delta Tower ATX Sort

Aerocool Delta-A-BK-V1 - ATX - Mid Tower Kabinet Tårn - Sort

  • Product no 1000598395
  • Model ACCM-PV45012.11
  • Brand AeroCool
  • EAN 4711099472796
Chenbro 19' 4HE RM42300 U3 ATX | One Door

Chenbro 19" 4HE RM42300 U3 ATX | One Door

  • Product no 995344741
  • Model RM42300F1-USB 3.0
  • Brand Chenbro Micom
  • EAN 4719274340298
Fractal Design Pop XL Air RGB Tower Udvidet ATX Hvid

Fractal Design Pop XL Air RGB Tower Udvidet ATX Hvid

  • Product no 1000652660
  • Model FD-C-POR1X-01
  • Brand Fractal Design
  • EAN 7340172703181
Fractal Design Pop Air Tower ATX Hvid

Fractal Design Pop Air Tower ATX Hvid

  • Product no 1000652652
  • Model FD-C-POR1A-01
  • Brand Fractal Design
  • EAN 7340172702986
Kolink Observatory Y AMD SE RGB Tower Udvidet ATX Sort

Kolink Observatory Y AMD SE RGB Tower Udvidet ATX Sort

SilverStone RM43-320-RS Rackversion Forlænget ATX / SSI EEB Strømforsyning Sort

SilverStone RM43-320-RS Rackversion Forlænget ATX / SSI EEB Strømforsyning Sort

AeroCool CS-108-S-BK-v1 Tower Micro ATX Sort

Aerocool CS-108 S-BK-v1 Tårn micro-ATX Ingen Strømforsyning Grå

  • Product no 1000466670
  • Model ACCS-PC16014.11
  • Brand AeroCool
  • EAN 4711099471720
Chenbro GEH 4U RM41300-F2-USB3 w/o PSU

Chenbro GEH 4U RM41300-F2-USB3 w/o PSU

  • Product no 994015007
  • Model RM41300H11*13719
  • Brand Chenbro Micom
  • EAN 4719274340250
TRYX LUCA L70 Tower Udvidet ATX Hvid

TRYX LUCA L70 Tower Udvidet ATX Hvid

  • Product no 1003019686
  • Model C-L700N-NN0H-G0W
  • Brand TRYX
  • EAN 6977029650209
  • AI-generated product data
HAVN HS 420 VGPU PC-Gehäuse, Midi-Tower, E-ATX, Tempered Glass, PCIe 5.0 Riser Kabel

Havn Hs 420 Vgpu Midi-Tower Tempered Glass

  • Product no 1003019979
  • Model HVN-CA-HS420-08
  • Brand HAVN
  • EAN 4251442512163
Phanteks NV series NV9 MKII Tower Udvidet ATX Sort

Phanteks NV9 MKII Tårn Udvidet ATX Ingen strømforsyning Sort

  • Product no 1002932769
  • Model PH-NV923TG_DBK02
  • Brand Phanteks
  • EAN 0886523303480
DeepCool CH270 DIGITAL Tower Micro ATX Sort

DeepCool CH270 DIGITAL Tower Micro ATX Sort

CORSAIR 5000T Tower Udvidet ATX Sort

CORSAIR 5000T Tower Udvidet ATX Sort

  • Product no 1002882182
  • Model CC-9011300-WW
  • Brand Corsair
  • EAN 0840440487753
Cooler Master Elite 301 Lite Tower Micro ATX Sort

Cooler Master Elite 301 Lite Tower Micro ATX Sort

  • Product no 1002552638
  • Model E301L-KNNN-S00
  • Brand Cooler Master
  • EAN 4719512151839
ASUS ProArt PA401 Tower ATX Sort

ASUS ProArt PA401 Tower ATX Sort

AeroCool Geh Mini CS-111 v1 MicroATX/MiniITX (black)

AeroCool Geh Mini CS-111 v1 MicroATX/MiniITX (black)

  • Product no 1002241659
  • Model ACCS-PC19013.11
  • Brand AeroCool
  • EAN 4711099476800
LC Power 8000B Tower Udvidet ATX Sort

LC Power 8000B Tower Udvidet ATX Sort

  • Product no 1002241781
  • Model LC-8000B-ON
  • Brand LC Power
  • EAN 4262443280203
CS-110-S-WT-v1 (weiß)

CS-110-S-WT-v1 (weiß)

  • Product no 1002237741
  • Model ACCS-PC18014.21
  • Brand AeroCool
  • EAN 4711099476831
Thermaltake View 170 TG ARGB Tower Micro ATX Hvid

Thermaltake View 170 TG ARGB Tower Micro ATX Hvid

Antec Constellation Series C8 ARGB Tower Udvidet ATX Sort

Antec Constellation Series C8 ARGB Tårn ATX Ingen strømforsyning Sort

  • Product no 1002375836
  • Model 0-761345-10022-9
  • Brand Antec
  • EAN 0761345100229
MK4 Black mATX (schwarz)

Sharkoon MK4 RGB Strip Micro Tower Sort

  • Product no 1002376599
  • Model 4044951041756
  • Brand Sharkoon
  • EAN 4044951041756
AK5 RGB Black ATX (schwarz)

Sharkoon AK5M RGB Midi Tower Sort

  • Product no 1002376591
  • Model 4044951041671
  • Brand Sharkoon
  • EAN 4044951041671
MK3 RGB Black mATX (schwarz)

Sharkoon MK3 RGB Micro Tower Sort

  • Product no 1002376598
  • Model 4044951041749
  • Brand Sharkoon
  • EAN 4044951041749
AK5G RGB Black ATX (schwarz)

Sharkoon AK5G RGB Midi Tower Sort

  • Product no 1002376603
  • Model 4044951041831
  • Brand Sharkoon
  • EAN 4044951041831
AK2 Black ATX

Sharkoon AK2 Midi Tower Sort

  • Product no 1002376585
  • Model 4044951041619
  • Brand Sharkoon
  • EAN 4044951041619
AK4 RGB Black ATX (schwarz)

Sharkoon AK4W RGB Strip Midi Tower Sort

  • Product no 1002376590
  • Model 4044951041664
  • Brand Sharkoon
  • EAN 4044951041664
Thermaltake CTE E600 MX Snow Tower Udvidet ATX Hvid

Thermaltake CTE E600 MX Snow Tower Udvidet ATX Hvid

CORSAIR FRAME 4000D RS ARGB Tower Udvidet ATX Sort

CORSAIR FRAME 4000D RS ARGB Tower Udvidet ATX Sort

  • Product no 1002936695
  • Model CC-9011296-WW
  • Brand Corsair
  • EAN 0840440487715
CORSAIR FRAME 4000D RS ARGB Tower Udvidet ATX Hvid

CORSAIR FRAME 4000D RS ARGB Tower Udvidet ATX Hvid

  • Product no 1002936696
  • Model CC-9011297-WW
  • Brand Corsair
  • EAN 0840440487722

Everything in Cases and PC Towers at DCS ApS

At DCS ApS, we offer a comprehensive range of PC cases and towers, catering to a broad customer segment – from gamers and businesses to home offices. The assortment covers everything from compact, space-saving cases to large, high-capacity towers designed for demanding configurations. 

We supply products from renowned brands such as Inter-Tech, Fractal Design, Listan, Corsair, MSI, Antec, and our own Nordic series, ensuring both breadth and quality. The case functions as the protective frame for all internal components, and our assortment allows resellers to offer silent models, minimalist designs, or transparent cases with a focus on aesthetics. 

How to Choose the Right Case 

The choice of case depends on the end user’s needs and the system’s purpose. It is not only about size, but also functionality, cooling options, and expansion potential that determine the final decision. 

Small cases such as Mini-ITX provide a space-saving solution but allow fewer expansion options, while full tower models offer maximum flexibility with room for advanced cooling solutions and powerful hardware. At DCS ApS, we assist resellers in putting together the right solutions for gaming, workstations, and business use. 

Key Specifications to Consider in a Case

When selecting cases for your assortment or customer solutions, you should particularly consider size, form factor, PSU compatibility, and visual design. Design also plays an important role, especially if the end user wants RGB lighting or a transparent case that highlights the components. 

Size

The size of the case determines whether there is enough room for all components. Efficient cooling systems such as water cooling usually require larger models, e.g. full towers, which provide plenty of room for both cooling and future upgrades. 

Form Factor

The form factor determines compatibility with the motherboard. An ATX motherboard requires an ATX or larger case, while some models support multiple form factors for flexibility in future upgrades. 

PSU/Power Supply

Some cases come with a built-in PSU, which can be convenient for simpler builds. However, for powerful graphics cards and processors, cases where the PSU is chosen separately are recommended, so the power supply can match the system’s requirements. 

Design such as Side Panel Window 

Side panels with windows are popular among consumers who use RGB components, as they showcase the hardware and lighting in a visually appealing way. This is especially attractive to gamers. 

The Different Case Form Factor Designations

The form factor is crucial for compatibility and functionality. Below is an overview of the most common case types. 

Mid Tower (ATX)

Mid tower cases are popular choices as they support ATX motherboards and provide a good balance between size and functionality. With room for multiple expansion cards, hard drives, and effective cooling, they are well-suited for custom-built PCs and versatile system solutions. 

Full Tower (Extended ATX)

Full tower cases are designed for demanding configurations and professional environments. They can house Extended ATX motherboards, multiple graphics cards, and advanced cooling systems, making them ideal for high-end gaming rigs and workstations. 

Mini Tower (Micro-ATX)

Mini tower cases provide a space-saving solution with support for Micro-ATX motherboards. They are compact but flexible and well-suited for home offices or secondary systems requiring upgrade options. 

Micro Tower (Mini-ITX)

Micro tower cases are very compact and designed for Mini-ITX motherboards. They require minimal space and are ideal for small offices, home PCs, or mobile workstation solutions where simplicity and space-saving are key. 

Server Cases 

Server cases are developed for business operations and data centers, where scalability and reliability are essential. They provide room for many hard drives, advanced cooling solutions, and ventilation systems and can be tailored to a company’s specific requirements.