The PowerShield Commander provides temporary backup power supply, telephone and modem surge protection with a pure sine wave. Use PowerShield Commander to protect: Servers Gates Copy Machines Laser Printers Applications that require remote connectivity Features: Works for gates, camera surveillance, computers, telephone systems, servers, and other sensitive electronic equipment. Best specifications in its class Intelligent real time battery backup display Smart 5% AVR with 2 step buck and boost Intelligent double stage charger control which translates to a faster recharge rate Generator compatible Highest Joule Rating: 1558 Joules of surge protection