Features:

20x hot-swappable SATA (I or II) / SAS drive bays, two 2.5" drive brackets
Five internal SFF-8087 Mini SAS connectors support up to twenty 3.5" hot swappable SATA (I or II) or SAS hard disk drives;
1 x slim CD-ROM bay,20 x 3.5 " hot-swappable drive bays , 2 x OS HDD brackets
Five internal SFF-8087 Mini SAS connectors support up to twenty 3.5" SATA (I or II) or SAS hard drives
Hot-swappable HDD tray with special designed power-off and lock mechanism.
Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6") motherboard
Screwless top cover
Redundant power connectors
RoHS Compliant
Seven ball bearing fans for better ventilation
Smooth border prevent lacerating your skin

Data Cable Option (not included): C-SFF8087-D, C-SFF8087-4S

Specifications:

Drive Bay:20 x hot-swappable SATA (I or II) / SAS drive bays, 1 x slim CD-ROM bay, 2 x 2.5” OS HDD brackets
Cooling Fan: 4 x 80mm middle fans, 2 x 80mm rear fans
Switch:Power ON/OFF x 1, System reset x 1
Indicator:Power ON/OFF x 1, HDD x 1, NETWORK X 2
Connector:Two front accessible USB ports, Five internal SFF-8087 Mini SAS connectors, ten 4-pin molex redundant power connectors
Motherboard Compatibility:Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6")
Power Supply Options:Standard ATX, mini redundant power supply
Dimensions ( W x D x H ):19" x 25.5" x 7 " (483mm x 650mm x 176mm)
Packing:Double boxes
Weight:18 kg/39.7 lb (NET) 21.2 kg/46.7 lb (GROSS)
Environment Temperature:0/55 °C, 32/131 °F (Operating) -20/60 °C, -4/140 °F (Non-Operating)
Relative Humidity:5% to 95%,non-condensing
Vibration:1 Grms (Operating), 2 G (Non-Operating)
Shock:10 G(with 11ms duration, half sine wave) (Operating), 30 G (Non-Operating)