s: This test lead is well designed with USB port, with male USB port This testing wire with alligator clips will help transmit for DC current to other multi-meters or other usage. Alligator clips can be used in conjunction with the wire as test leads and used for light bulb and power adapter, worked with power bank for testing voltmeters, etc. Made for copper wire and well-made PVC and it can pass 3-5A(max) current during your testing work. High performance, lower resistivity and durable, fast and stable, high-speed output current USB Testing Usage: USB Male Testing: Connecting the USB male alligator clips to 10 load and then connecting to the USB safety tester; Finally, the USB safety tester will display the voltage and current USB Light Bulb Well connecting the light bulb with a battery (by USB 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: 33.2cm/13.07" Quantity: 1 Pc Note: Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you Package Contents: 1 x USB Male Aligator Clamp