This is a YouTuber that thinks of various DIY stuff that will definitely come in handy at some point in your life. In this particular video, MrGear shows us how to create some awesome devices using only some common items.
Building your own tripwire alarm system or lighter made out of battery surely sounds interesting.
By using some simple products like a couple of bells, a clothespin and a 9V battery, you can make yourself some neat little devices that will come in use from time to time. Check out the video!