Built-in DVR Record Video Audio Included.Included 128GB Memory card:The monitor has a built in mic and built-in speakers so that not only visual but even aural information.Advanced DVR function with loop recording.It support 128GB SD card at max.The special point is that we can keep the DVR to record even we turn off the monitor.Saving the video automatically just in case,so we can find the video easily if we need. More additional Useful Function:1.Mirror Image function 2.IP69 highly Waterproof Cameras,can work at 59°F to 176°F 3.Muti-angle adjustable bracket,so you can install it to dash or ceiling of vehicle. 4.If we want to watch the video on computer,just need to use a card reader and insert the TF card of the monitor,then we can watch it.6.Can keep to DVR to record even you leave the vehicle or fall to sleep,a good soldier for your safe.7.Adjustable parking lines. HD 4K Video:1920*1080 Pixel Monitor.6 CCD 1080P Cameras.Extremly HD and stable Image.HD day and night image helps us to observe everything surrounding us,avoid the blind spot.So we can drive with a pleasant mood. Makes our driving 100% safe. Best Partner for: RV Truck Trailer Class A Box truck semi truck Travel Trailer Horse Trailer Bus School Bus heavy duty Camper Tractor, the 5th Wheel,Motor homes.Wide voltage power input:12-36V DC Power. 4K Bluetooth Touchable 11-inch Monitor:Wide 11-inch Screen,so we can observe 100% road situation.Larger screen,safer driving.6 split screen,6 channels,6 different angles help us to get a 360 degree view.For rear,parking, front, side,left,right,hitch,turn signal view.We also can choose the monitor to display 2/3/4/5/6 cameras' image.We can drive confiedntly.Bluetooth Function to play Music or FM.