This modern looking black portable car jump starter by EAFC has a peak power of 600A and a capacity of 12000mAh, making it suitable for 12V batteries. It functions as described and includes a USB connectivity feature for charging devices. This unit is designed as a compact and convenient solution for boosting car batteries in emergencies. You can also charge USB devices such as mobile phone and use with tire inflators. If attempting to start a car where the battery has gone flat overnight, it is recommended you connect the device and switch on but leave it connected for at least 60 seconds before you attempt to start the car.