Alfred - Home Security Camera is an app that lets you turn your Android into a surveillance camera. To take advantage of the app, you´ll need a smartphone (ideally an old one or one that you don´t use anymore) that you use as a surveillance camera and another one that you can use to monitor your home.
The most interesting option of the Alfred - Home Security Camera app is the motion detector. Once you click on this option, the surveillance camera will turn on as soon as it detects motion and you´ll receive a notification on your smartphone. In the settings, you can choose the motion sensibility and the length of time the memory will save the video.
It is important to keep in mind that for Alfred - Home Security Camera to work correctly, you need to keep the phone that acts as the camera connected to the internet. Normally this is not a problem since this phone stays home connected to the WiFi.
Alfred - Home Security Camera is an excellent app that lets you turn your old Androids into real surveillance cameras.