... /camera/Car Mirror DVR/ 3.5 inch TFT Mirror Parking Sensor with DVR function--DVR-BT728SC4 Features:Built-in 3.5 ... , such as iPods, MP3 to enjoy wireless stereo listening Parking sensor system(RD078) is availableVideo in connector for any video source ... started, the system automatically start working.The yellow LED will light.- To check DVR working state, press PLAY button 3 seconds ...