• 20x hot-swappable SATA/SAS drive bays
• Supports up to twenty 3.5" or 2.5" SATA or SAS disk drives;
• 1 x slim CD-ROM bay,20 x 3.5" hot-swappable drive bays , 2 x 2.5" OS HDD brackets
• Backplanes are horizontal mounted for better ventilation
• Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6"), Mini ITX (6.7" x 6.7") motherboard
• RoHS Compliant
• Redundant 4pin molex PSU connectors support redundant power supply
• LED indicators for power and activity on each HDD tray
• Ball bearing fans for better ventilation
• Front accessible USB port
• Smooth border prevent lacerating your skin
• 4pin Molex Power Adapter Option (not included): Sata power to 4pin molex power adapter

Specifications: 

Drive Bay: 20 x hot-swappable SATA/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
Motherboard Compatibility: Support EEB (12"x13"), CEB(12"x10.5"), ATX (12"x9.6"), Micro ATX (9.6" x 9.6"), Mini ITX (6.7" x 6.7") 
Power Supply Options: Standard ATX power supply, mini redundant power supply (H x W: 5.91" X 3.39")
Dimensions ( W x D x H ): 16.9" x 25.5" x 7 " (430mm 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 ( 5-500 Hz ):1 Grms (Operating), 2 G (Non-Operating) 
Shock : 10 G(with 11ms duration, half sine wave) (Operating), 30 G (Non-Operating)