Features: 1.Power inverter: With dual USB ports and universal socket. Comes with plug cable and 2pcs battery clips, providing 300watt continuous power, 4000watt peak power (Please make sure that the total rated power of the connected devices is 300W). 2.Green/red work light: When inverter work normal, the green light work and tell you it is working well. When it is on protection status, such as low voltage, high voltage, over temperature, or over load, the red light will light up and you need to turn off the inverter, and check which protection function is work, and try to solve it then the inverter can work again. 3.Battery capacity display: LED display shows the battery capacity, which can remind you that when your battery no power. When connect the battery with inverter, LED screen work and show the real-time capacity of battery. Each lattice represents 20% of the battery power. 4.Fast charging dual USB ports: One AC outlets and two USB ports can offer fast charging for mobile phones, computers, rescue device, emergency equipment etc, can be as a emergency power supply. 5.Multi protection: Built-in fuses, safe charging design and cooling fan prevents the car power converter from over-heat, saving power and energy. over voltage, overload, over-current, short circuiting, under-voltage, overheating, short circuit protection. 6.Lightweight design: Lightweight and compact, ideal for vacations, camping and work trips. It can be plugged into almost any 12V power output vehicle, providing charging opportunities anywhere. Specifications: Name: Car power inverter 4000W Model: Y4000-Blue Peaks power: 4000W Rated power: 300W Input voltage: DC 12V(Voltage range: 10.5V~15V)(When the battery voltage is lower than 10.5V, the inverter is low voltage protection, when the battery voltage is higher than 15V, the inverter high voltage protection.) Output voltage : AC 110V /220V for your choice Output frequency is: 50Hz for 220V model /60Hz for 110V model. Output waveform: Modified sine wave. Dual USB interface: 5VDC/2.1A No-load current: 0.5A Conversion efficiency: greater than 90% Product size: 205mmX117mmX58mm/8.07in*4.60in*2.28in Product weight:0.6kg/21.16 oz Package size: 220mm*100mm*145mm/8.66in*3.93in*5.70in Package weight: 0.8kg/28.21 oz Application suggestion for Y4000 Model: Applicable loads for rated power under 300W: 5W Cell phone. 5W Breast pump. 10W Digital electronics(Car navigation/Digital camera). 10W Game console. 5W-10W Electric shaver. 20W LED lamp. 25W Walkie talkie. 50-100W Laptop.60W Compact fluorescent Lamp. 60W Incandescent lamp. 60W-Mechanical electric fan. 60W-150W TV . 80W VCR. 180W Desktop computer.