When a standard USB cable cannot transfer enough power to operate an external device, such as a portable 2.5in hard drive, you need a USB 2.0 Y-cable with additional power.
Simply plug this cable's USB B end into the device, and then plug the two USB A ends into open USB ports on one desktop PC or Mac. This cable then pulls power from both USB ports, and thus increases the output to the external drive.
The red moulded hood on the auxiliary USB A connector enables the user to quickly distinguish between main and auxiliary power. Foil and braid shielding reduces EMI/RFI interference, and twisted pair construction reduces crosstalk for high speed, error-free data transfer. This cable is compatible with USB 1.0, 1.1, and 2.0 specifications.
Please Note: This cable is not designed to split USB signals to multiple computers. The two USB A connectors are meant to plug into USB ports on the same computer.
It only can connect 2.5'' hard drive, it won't support 12v 3.5'' HDD.
Specifications
Connectors: 1 USB type B Male to 2 USB type A Male
Foil and braid shield reducing EMI/RFI interference
Red moulded hood for auxiliary power
USB 2.0 compliant
Cable length: 80cm + 20cm