MP3 player DVR camera Picture pixel: 1.3 million pixels View angle: 65 degrees Video compression: AVI format Video resolution: 640 x 480 pixels Recording frame rate: 20fps Photograph resolution: 1,280 x 960 pixels Photo format: JPG Supports TF card:  4GB Charging time of battery: 2 hours Working voltage: 3.7V Charging voltage: 4.2 to 5 Operation temperature: -10 to 50 degree Celsius Storage temperature: less than 80 to greater than -20 degree Celsius Operation humidity: 15 to 85% RH