... Touch Button Mirror Monitor, 2 Way Video Inputs, V2 Auto-reverse for Camera, Mobile Bluetooth is Optional, ... Outputs: one for montor, the other one for DVR or extra monitor;2, Four camer Video inputs ... till other acction is done. Then front viewand DVR rework after other acction till press front switch again ... Side Camera; X1 Back-up CameraSpecial Features:1, DVR for Special use such as accident etc.;2, ...