CCTV:

This might be a something that you might not be aware of. You can always turn on your old android device into a surveillance camera. If you are not at a particular location and wish to monitor the location through CCTV, your old Android device is the best option to use. You hardly shred money for this. All you need to do is get your camera under Wi-Fi zone (recommended than using mobile data by interesting additional SIM), fix a particular location so you can dock it for charging the phone easier, Download IP Webcam from Play Store and follow the instructions in it.