It is a 7inch digital wireless reversing camera system,AHD 1080p Monitor and Camera,this system good for Trucks, Harvesters,Planters,RVs etc,the transmitter and receiver distance with 200M range,Up to 4 wireless camera base on required,Video recorder optional, up to 256G SD card,camera with LEDs,good image both day and night,also it was easy to install, not like the normal wired system, this system no need to install the extension cable. more detials you can see our item number: ST-799WRS-4