If you update your outdated gadgets as much as I do, you probably have a small collection of older devices with very low resale value lying around it. Don’t toss them or sell them on Olx/Quickr. If you don’t already have an integrated wireless security camera (or if you hate what you have), you might find that your old smartphone is the key to wireless security cameras which means you can Turn useless Smartphone into wireless security camera
http://blacklisthackers.com/turn-useless-smartphone-into-wireless-security-camera/