Fourth Generation Signal4th Generation Digital Signal,120ft No Delay. Transmission Rate Reaches 7200bps. You can Observe the Stay Smooth and Clear Road Conditions in Real Time even at 85 Mile High-Speed. Wireless means that there are no cables between the cameras and the monitor. Just connect the camera to the monitor via wireless signal. The cameras and the monitor need to be plugged in for use. HD 1080p and Record VideoAdvanced AIST Technology to Generate HD Images,Built-in 32G memory card for recording video.And You Can Play Video on Monitor.Making Your Receiving More Confident and Safe.