Feature: 1. Power Inverter: This power inverter can convert DC input to AC 220V output, offering you stable power supply and high efficiency. 2. Broad in Match: Comes with dual AC sockets and 5V 2.1A USB port that are highly compatible with laptop, printer, DVD and so on. 3. Reliable Works: Allows for wide application on household appliances, vehicles, field work, industry, office, tourism and more. 4. Working Safety: Has overload protection, low voltage protection, high voltage protection, overheating protection and short circuit protection. 5. Faster Cooling: Using stepless adjustment and temp control, the inverter with aluminium casing and cooling fan is very reliable. Specification: Item Type: Power Inverter Model: GK DZ 4000W Material: Aluminium alloy, copper. Output Power: 4000W Peak Power: 8000W Output Waveform: Pure Sine Wave Output Voltage: 220V AC USB: DC 5V 2.1A. Output Frequency: 50Hz or 60Hz Ambient Temperature: -10℃ - 50℃ Storage Temperature: -30℃ - 70℃ Relative Humidity: 0-80, non condensing. Level: Approx. < 1000m / 3280.84ft. Package List: 1 x Power Inverter14 x 30A Blade Fuse4 x Battery Cord1 x User Manual