Feature 1, The product has an external fuse, the reverse prompt, and the battery display. 2, 4 USB interface and 2 cigarette lighter interfaces, are easy and convenient to use. 3, The inverter has builtin microcomputer processor and complete protection circuit, with installation protection functions. 4, Can achieve undervoltage protection, overvoltage protection, overload protection, over maintenance protection, short circuit protection, over temperature protection, surge protection, etc. 5, With intelligent automatic protection function, advanced antiinterference technology, soft start circuit, and convenient operation mode.Features: The product has an external fuse, the reverse prompt, and the battery display. 4 USB interface and 2 cigarette lighter interfaces, are easy and convenient to use. The inverter has built-in microcomputer processor and complete protection circuit, with installation protection functions. Can achieve undervoltage protection, overvoltage protection, overload protection, over maintenance protection, short circuit protection, over temperature protection, surge protection, etc. With intelligent automatic protection function, advanced anti-interference technology, soft start circuit, and convenient operation mode. Specification: Condition: Brand new Material: metal Color: As pictures shown Type: Automotive Inverter Circuit Topology: Full bridge Output Voltage Waveform: Correction wave Input Voltage Range: 12/24 (V) Output Voltage: 220 (V) Output Power: 4000 (W) Inverter Efficiency: 85 (%) Voltage Regulation Rate: 5 (%) Load Adjustment Rate: 5 (%) Rated Capacity: 4000W Output Frequency: 50 (HZ) Maximum Output Power: 4000 (W) Continuous Output Power: 650(W) Package List: 1 x Inverter 1 x Black and Red Power Cord 1 x Instruction Manual Note: 1. When installing the cable, please use the wire supplied by the manufacturer. 2. If the 220 volt output line is too long or the wire cross-sectional area is too small, a large amount of power loss will be generated on the wire. The power at the load end is small and the voltage is low.