AUTO-VOX Easy to Install Universal 3.5 Inch LCD Car Reverse Rear View Monitor 2.4G Wireless with 170 Degree Wide Angle Waterproof Backup Color CMD Distance Scale Line Car Camera 2.4GHz Wireless Built-in. Parking guide lines--Projecting distance scale lines onto the monitored image Monitor mounts to windshield or dash board for easy-to-see rear coverage Camera has a water-proof, wide angle lens with high resolution and low illumination for night vision Monitor can be 360 degree circumrotated.With buttons for menu operation This product is used for cars with 12V power supplies, it is not applicable for vehicles with 24V or higher power supply