1.This is a DC to AC power inverter. 2.Its a multifunctional power inverter. 3.have short circuit protection ect. This is a DC to AC power inverter .high voltage protection, overload protection, short circuit protection, overheating protection.MODEL:DXP1200HUSB INPUT :12V OUTPUT:220V USB 5V POWER:1200W SIZE:191*95*55MM N.W:821g PER CASE :10.35kg PCS/CASE:10pcs SIZE:61*25.5*26CM