I'm after an on/off switch for a micro-B usb port. The reason is my phone's wireless charger makes an annoying noise when it's plugged in but not working, and switching on and off at the mains is annoying when you're at a work desk and it's under and in back somewhere.

I guess I could use a mains switch, which would be more efficient. I have one at home and they're about $50 from memory. It's not worth that much money to me.

Pic of ports