Know your gear
USB3-Y is an 18" USB 3.0 auxiliary power / extension cable that is backwards compatible with USB 2.0 and 1.1. If an external USB hard drive or other device needs more power than a single USB port can supply, this cable allows you to combine voltage and current from 2 USB ports which can create enough power to run that device without the aid of an AC Adapter.
USB3-Y has 2 type A USB 3.0 male ends that plug into the computer and 1 USB A Female end to plug your external drive or device into.
USB3-Y has 2 type A USB 3.0 male ends that plug into the computer and 1 USB A Female end to plug your external drive or device into.