Automatically records and alerts when it detects rear car ride No need for regular format of SD cards, and the included heavy-duty MLC SD card is highly resistant to repeated overwriting. Both front and rear are equipped with STARVIS and HDR for greater clarity. 2 cameras allow 2 megapixel full HD recording of the front and back of the vehicle. Safety driving support function. Safe to use with privacy glass or smoke film. Reliable 3 year warranty. Direct power supply cord with 5V converter included. For 12V vehicles only. Simple packaging, instruction manual download type.