Feature:Support 4 USB interfaces to work at the same time,easily meet the power supply needs of diverse vehicle electrical appliances.12V is generally for cars, 24V for trucks, 48V and 60V is generally for electric vehicles.Available Range Of Rated Voltage Of Electrical Appliances : 200~240V, 100~120VSafe Range Of our inverter Input Voltage:12V (9.8~15V)Specification:Name: Car power inverterInput voltage: DC 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 choiceOutput frequency is: 50Hz for 220V model /60Hz for 110V model.Peaks Power : 4000WRated power: 300WOutput waveform: Modified sine waveProduct Size:19.5*10.5*6.8cmCAUTION:This is a modified sine wave inverter,NOT applicable for devices which work by built-in motor, hair dryers,air conditioners, coffee machine,water pump, induction cooker,refrigerators and microwave ovens etc.Make sure that the total rated power of the connected devices is 400WTighten the Positive (+) and Negative (-) terminals when the car converter is in usePlease do not leave the inverter in the ON position before car start.It's easy to damage the inverter before connected to the battery.The correct operation is connect to the battery first and then turn on the inverter switchIt's normal for the inverter to become warm while you are using it.In order to get the best using results, please put the inverter on the flat surface The working place should meet the following criteria:Keep dry, should not let the inverter contact the water or other liquids, keep the inverter away from moisture or water.Cool environment, keep the temperature between 0 Celsius degrees and 40 Celsius degrees. Do not put the inverter next to heat vents or other devices. Try to keep the inverter not be shi