?Premium Support? VASTEND provide the best customer service and technical support and provide a two-year warranty. If you have any questions, please contact us, we will reply within 24 hours and help you solve the problem. ? DIY Parking Guide Lines and 4CH Monitor?Our rearview camera for truck can support adding 1-4 cameras. You can add four rear view cameras/side view cameras/front view cameras. In the menu, you can DIY the guideline by yourself, which lets you adjust the parking guidelines to portray real-life conditions. but also built-in recording function and loop recording, continuous recording when the memory card is full, automatically erases old files, very convenient. ?HD1080p Clear Picture Quality ?1080P HD resolution for clear images,provides you with extraordinary visual experience. The150°viewing angle has a good peripheral vision so you can see everything happening during reversing with a clear view, providing full coverage. Provide night vision function, so that you can clearly see your reverse image even in the dark. Make you driving safer. ?Stable Signal Transmission ?The wireless backup camera for trucks has an upgraded and unique dual-antenna design, which is superior to other single-antenna vehicle backup cameras in terms of stability, signal transmission distance, durability and power. Signal up to 990 ft in open areas and works within vehicle range up to 320 ft.Interference is handled well without worrying about signal loss.Please note that our monitor and rear view camera need wiring to connect to the power supply. ?Latest Radar Function?VASTEND 7inch wireless backup camera uses the latest radar design, which can display the distance of the detection target in real time, and can detect static and dynamic objects. Alarm sounds when the vehicle is close to the backup line. The closer the distance, the stronger the tone. You can adjust the sound at will. In addition, the trailer camera is very easy to install. The attached installation manual for reference. Very suitable for RVs, trucks, trailers.