Features: One key to turn on the recording mode, convenient and quick.  Built-in camera, high-definition shooting, record beautiful moments.  Built-in noise reduction chip, intelligent noise reduction, high-definition recording.  90-day long standby, built-in large-capacity environmentally friendly battery, can be used for 90 days when the watch is used, continuous recording 3-5 hours, charging time 2 hours per month.  Intelligently save files when power off to prevent data loss.  Automatic time stamp, the system automatically updates the time, and accurately records the creation time of the recording.  Support OTG transfer to mobile phone, read files anytime and anywhere.  Water-proof and sweat-proof, it will not be affected when wearing in rainy days.  Battery: Environmentally friendly polymer lithium battery;  Battery capacity: 300mAh;  Charging time: about 2 hours;  Standby time: 90 days;  Usage: One-key recording;  Photo format: JPG;  Video format: AVI;  Recording format: WAV;  Photo resolution: 1920*1080P;  Camera resolution: 1920*1080 30atfps;  Lens parameters: F/NUMBER 2.25;  FOV: 65° OV9732 SENSOR;  Size: 2.7 x 5.6 x 1.3cm;  Weight: about 34g;     Package Included: 1 x D3 Voice Recorder;  1 x USB Cable;  1 x User Manual