Image is Representational - See Manufacturer Specs | Uninterruptible Power Supply (UPS) - 500VA / 300W - 120VAC / 120VAC Input/Output - 4.2 min Backup Time - Screw Terminals. The SDU500B is uninterruptible power supply with dimensions: 10.910 L x 5.220 W x 4.890 H (277.00mm x 132.70mm x 124.20mm).