Digital Wireless 4 Channel Video Input 7 Quad Split Monitor Built-in DVR Maximum Storage Support Up to 128GB & 3x Magnetic Backup Camera & 1x Fixed Digital Wireless Camera + Free 32GB SD Card For RV Trailer Truck BUS. Adjustable Width / Height. UP to 4 Channels. Easy to Hitch Trailer: connecting your vehicle to any trailer in seconds, Boat, Camper, Trucks, and More. REALLY EASY TO USE! 100% Wireless and Portable:Wireless Connection, view hitch camera with 7 IPS monotor, Easy installation, safe reversing. Rechargeable Battery: Built-in Lithium Ion Rechargeable Battery 9600mAh, Battery life will last for about 24 hours of continuous use, Included Charging Cable Plugs into vehicle’s 12v power port(cigarette lighter). IP68 Waterproof & Night Vision: with 4 automatic Infrared night vision lights in the darkest night. This 7 Digital Wireless Monitor Build in 4 Channel wireless video Input, according to your needs, you can set up your favorite display model, to display 1 image, 2, 3 or 4 at one time. The Reversing Line can be turned on /off, and Width and Height also can be adjusted on this 7 Monitor setting. This Item comes with free 32GB SD CARD, it can last 2 hours to record video continuously. 1x 7 Digital Wireless Quad Split Monitor. 1x Monitor power cable. 1x Portable Magnetic Wireless Camera. 1x Camera power cable. 1x Cigarette Lighter Adapter Switch. Positive feebacks and Excellent DSR will be much appreciated! If you have any problem. Please feel free to contact me, we do try respond as quickly as possible.