This handy PI2-SWITCH allows you to have a Raspberry Pi with a switch.
Just hook up the standard USB end to 5V 2A USB port power supply ( like ABRA's DC-5200-USB) and the Micro B end to a Raspberry. No need to unplug your Raspberry Pi; just use the on/off switch on the cable.
Can be used for any single-board computer with a Micro USB connection
Length of Cable is 150cm, which is long enough to go from the wall to your work area.
This cable does not transfer data. It just adds an on/off switch to your power supply.