FreeRearviewCam app for iPhone and iPad

Create a rearview camera system with two smartphones – and that for FREE!
Your current smartphone is used as a monitor near the driver. Your "old", unused smartphone finds its place "behind" in the car or trailer or ... and uses the camera functionality. The app connects the two smartphones, the camera of the "old" and the monitor of the "new" mobile phone - the rearview camera is finished.
If you want to use the reversing camera ad-free and with the recording function is a small surcharge due (Version Advanced).
A Pro version with special features is planned for the future.

REMINDER: the transfer of the video is very battery consuming especially for the camera phone. If you want to use it for an extended period make sure to connect it to power and/ or switch the phone off after use.