Stable and Long Transmission Range: on road tested for up to 100ft at highway speeds in open area. Compatible with RVs, motorhomes, trucks, semi-trailers, box trucks, tractors, machines and buses Ideal Screen Size with Crystal Clear Image: 7 High Definition Screen displays high quality camera image, anti-shock design and ideal size no block vision to driver. Quadscreen Monitor can connect up to 4 cameras max, can be Single, Split-screen, 4 Split Quad View or H-Split View Mode With DVR Recording and Playback: DVR recording support to use 8-128GB SD card and loop recordingSD card not includedIP69K High Rating Make Camera Very Durable and Suitable in all Environment Easy to Use and Easy to Install: installation time takes around 1 hour, monitor will start up automatically and synchronously display the video from camera when you are backing your vehicle We provide lifetime best customer service and honor 1-year warranty. Feel free to contact us may any query.