Warm Tips: 1.Please adjust the sensitivity of G-sensor to Low or turn it off if your monitor shows "card full" even with loop recording function open of this dash cam. 2.The function of built in 150mAh battery is just for emergency recording and save settings. Please keep the dashcam plugged in always, the dual dash cam will shut down after 5 seconds when there is no external power connection. 3.To ensure seamless video recording,please kindly turn off “motion detection” of this dash camera while driving. 4.If you want screen off but dash cam still keep recording, just choose" screensaver" in setting, dashcam will keep recording as normal. Specification&Package : Screen : 3 inch LCD Display Lens : 170° Wide Angle Lens Video format: AVI G-Sensor Lock : Supported Internal Power: Built-in Li-ion Battery External power supply : DC 5V/1.5A Operating temperature : -86°F～+158°F Storage : Micro SD Card 32GB (NOT included) Package :1 x CHORTAU Dual Dash Cam B-T13;1 x Rear Camera; 1 x Car Charger;1 x Adjustable mount;1 x User Manual