USB Female Testing:         Both well connecting with the power bank by USB female alligator clips and the USB safety tester, it will display the voltage and current on the tester     USB Light Bulb         Well connecting the light bulb with a battery (by USB female alligator clips) and the bulb, and then it will light up     Specifications:     Color: Red and Black (V+ and V-)     Power: 5V     Working current: 3-5A     Lines size: 2x18AWG          Cable Length: 50cm Package included: 1 x USB Female Aligator Clamp