If you paid more than 50p you were robbed.
But here are three indispensable, I can't manage without it, uses:
1. Of all the suggestions I've seen so far on here, this is the best one. With your house windows open in the hot weather, use it as a door stop to stop any cooling breeze from slamming a door shut.
2. During the winter plug it into your laptop and the 0.1W of mighty heat will help keep your house as warm as toast.
3. Finally, when you go on long bike ride and get lost in the middle of nowhere, plug it into your laptop, the GPS
will show you where you are so you are no longer lost won't work and you will still be lost, but if you keep cycling for long enough, you will eventually reach the sea somewhere as we are an island.