The ultimate on-the-go power solution! With 3600 Wh-21600 Wh expandable capacity, 4000W AC output, 15ms UPS, 10-year lithium iron phosphate battery life, & a convenient pull-handle design, you'll never run out of power again. 3600 Wh Capacity 4000W AC Pure Sine Wave Output (6, 000W Surge) Li Fe PO4 Battery for Over 3, 500 Cycles to 80% Expand the Capacity from 3600 Wh to 21600 Wh Fast Charging: From 0-100% in 1 Hour Unique Voice Control, Smart Wifi, & Bluetooth Connection Support Touch Screen Operation UPS Battery Backup under 15ms Solar Input: 12V-150V, 40A, 2000W Max MPPT Eco-Friendly/ Gas Free/ Quiet/ Cost-Effective