Specification:

USB 3.0 Micro-B to USB Type A (X2)
Compatibility: Any USB 3.0 portable hard drive that connects to USB 2.0 or 3.0 ports
Length: 40cm
Features:

This USB 3.0 Y-cable provides a transfer rate of up to 4.8 Gbps when connected with a USB 3.0 compliant host or device.
An additional USB Type A connector allows the cable to be connected to USB ports (2.0 or 3.0) for maximum power and performance.
Compatibility: Any USB 3.0 portable hard drive that connects to USB 2.0 or 3.0 ports
Length: 40cm
Supply more power for high power consumption devices.
Box contents:
1 x USB 3.0 Y-Cable Box Contains 1 x USB Cable