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 Output waveform:Modified sine waveActual power: 4000W Peak power: 500WRated power 300WInput voltage: 12V Input voltage range: 9.5V-15.5V Output voltage: 220V Output voltage range: 220V 10% Frequency: 50Hz / 60Hz Inverter efficiency: 0.9 Circuit topology: push and encourage type No load current: 0.7A Low voltage protection: with a minimum protection voltage of 9.5V High voltage protection: with a maximum protection voltage of 15.5V Overload protection: Yes Output short circuit protection: Yes Reverse connection protection of positive and negative poles: Yes Output voltage stabilization: Yes Protection buzzer: Yes USB interface: 2.1A x 2 Input terminal connection mode: terminal Output interface: international general socket Product size (mm):161mm/6.28in x 112mm/4.37in x 56mm/2.18in Package informations:Package Size:187x100x145mm/7.29x3.9x5.66in Package weight:650g/1.43lbGeneral Box Package Package included:1 x Power inverter1 x Alligator clip1 x Cigarette lighter Noted: 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.