USB port: 5V500mA Output socket: ABCDEFG type optional Products Description : ... such as laptops, DC players, phone chargers etc. USB charging port offers an additional choice for user. It can charge ... the power on·Input & output isolation·Muti-protection function·USB output port: 5V500mA ( optional)·Socket type : A,B,C,D ... EMC/LVD,RoHS, E-markWarranty18 monthsNote: if without USB, the model is CAR7502