Features: 1. Dual LCD digital display enables you to hold the output voltage and battery voltage value at any time. 2. Fault prompt function. In addition to different sound prompts, it can also be displayed more intuitively from the display screen (for example, battery undervoltage, battery overvoltage, overload, high working temperature, output short circuit, etc.). 3. The overload delay closing function is added in the product to solve the sensitive problem of inverter protection when the soluble electrical appliance is started. 4. The small power non professional user market has increased the positive and negative pole return protection function. 5. Intelligent temperature control oil sealing fan. When the inverter is working, it can work at a certain temperature, which is more energy-saving and quieter. 6. Digital MCU control, output wave type, more accurate frequency, accurate output voltage, fast response of protection circuit. Descriptions:1.This is a power inverter,using STM-chip technology and kinds of intelligent protection,high reliability. 2.Widely used in cars, steamboats, mobile offering post and telecommunications, public security, emergency and other field. Specifications:Color:Black / Yellow (Optional)Output waveform:Modified sine waveActual power: 4000WPeak power: 500WRated power300WInput voltage: 12VInput voltage range: 9.5V-15.5VOutput voltage: 110V / 220V (Optional)Output voltage range: 110V 10% / 220V 10%Frequency: 50Hz / 60HzInverter efficiency: 0.9Circuit topology: push and encourage typeNo load current: 0.7ALow voltage protection: with a minimum protection voltage of 9.5VHigh voltage protection: with a maximum protection voltage of 15.5VOverload protection: YesOutput short circuit protection: YesReverse connection protection of positive and negative poles: YesOutput voltage stabilization: YesProtection buzzer: YesUSB interface: 2.1A x 2Input terminal connection mode: terminalOutput interface: international general socketProduct size (mm):161mm/6.28in x 112mm/4.37in x 56mm/2.18in Package informations:Package Size:187x100x145mm/7.29x3.9x5.66inPackage weight:650g/1.43lbGeneral Box PackagePackage included:1 x Power inverter1 x Alligator clip1 x Cigarette lighterNoted:1.Please allow 1-2mm errors due to manual measurement.2.Item color displayed in photos may be showing slightly different on your computer monitor since monitors are not calibrated same.