For the USB cable with 2 ends, one end is with 1 interface and another end is with 2 interfaces.
Plug the one with 1 interface into the Coast 10. Plug the one with 2 interfaces into computer.
If the indicator light is on, it means you did a successful connection.
For the end with 2 interfaces, the extra interface is designed to avoid the insufficient electricity supply. If the indicator can't light on with 1 interface plugged, plug both 2 interfaces into your computer.