Note: This product does not support three-way camera work at the same time, it can only keep two-way camera work As the front camera+car camera works at the same time, or the front camera+rear camera works at the same time. If you install a rear view camera, select the screen for front camera+car camera mode, and when reversing, the screen will automatically show the rear view screen in full screen. Cancel reverse will automatically restore in the car camera video+front camera mode and reverse does not affect the car on and off recording simultaneously. mini car dvr with double cameras Resolution: front camera: 1080p rear camera: 720p car camera: 720p Front camera: 170 degrees A+Grade Wide Angle HD; Rear camera: 140 degrees wide angle; Car camera: 120 degree big angle Photo format: JPEG Compression format: H.264 Video format: AVI (1080p) Screen display: 4.0 inch IPS screen Night vision: support G sensor: support Time stamp: support Memory card: TF (maximum support 32G) Package dimensions: 17x11x8cm Weight: 0.56KG Backup camera Angel of vision: 170 Image chip Color CMOS: 1/3 inch TV system: NTSC/PAL Effective pixels: 628* 582 pixels Horizontal resolution (TV lines): 420 TV lines Source feeding: DC 12V Video output: RCA connector, 1.0VP-P, 75Ohm S/N ratio: more than 48db Electronic shutter: 1/50-1/10,000 seconds IP rating: IP68 The package includes: 1 x Car DVR with backup camera 1 x Car charger 1 x Rear camera cable 1 x Rear camera cable 1 x Withdrawal box 1 user manual