For use with devices with AC voltage 220 Output voltage is constant with load changes Contains a cooling fan to prevent overheating of the device Contains multiple protection systems to prevent damage to the device and battery Audio warning If the battery voltage drops and the voltage reaches below 11V, the output will be cut off automatically. Protection against overheating (if it is not possible to cool the device to the level allowed by the fan, it automatically turns off the output and turns off). If there is a short circuit at the outlet of the device, it turns off and disconnects the output. In case of failure to contact the device body is protected. Convert 12V to 220V AC to power up city powered appliances. Pay attention to 500W maximum, do not use the maximum power of the device for longer durability. Device Dimensions:140*115*50mm