Some time ago, I shared a post of how to make your own USB powered LED light. If you follow that post, you will be able to make your own USB powered LED light that can be attached to a USB 2.0 power adapter on your wall socket. When you turn on your wall socket, the lights will turn on. After you are done with using your light, you can turn off your wall socket to turn off the lights.
Sounds like common sense right?
However, your wall socket plug may be too far to reach at your convenience. In such a situation, you may want to add a switch onto the cable of your USB powered device.
Given that, this post discusses how we can add a switch to a 5V USB wire. In this post, I will use a white inline cord switch as an example to show how we can add an inline cord switch to a 5V USB wire.