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 InverterModel: GK DZ 4000WMaterial: Aluminium alloy, copper. Output Power: 4000WPeak Power: 8000WOutput Waveform: Pure Sine WaveOutput Voltage: 220V ACUSB: DC 5V 2.1A. Output Frequency: 50Hz or 60HzAmbient Temperature: -10 - 50Storage Temperature: -30 - 70Relative Humidity: 0-80, non condensing. Level: Approx. < 1000m / 3280.84ft.Package List:1 xPower Inverter14 x 30A Blade Fuse4 x Battery Cord1 x User Manual