HD recording with zero noise. Automatically saves recording when powered off, with automatic encryption. HIFI MP3 music playback, fully charges in 30 minutes, supports up to 38 hours of continuous recording. Silent recording mode with no light display or vibration. Rapid charging and fast forward/backward playback functionality. Time setting feature for accurate recording timestamps. Ideal for use in schoolbags, collars, drawers, inside vehicles, and similar locations. Item Type: MP3 Voice Recorder Memory Capacity: 16GB Recording Format: WAV Recording Time: Up to 38 hours continuous Standby Time: Up to 68 hours Recording Mode: One-click recording, one-click save, one-click playback/pause Microphone: Built-in HD microphone Sampling Rate: 48kHz Bit Rate: 192kbps Battery: Built-in eco-friendly lithium battery USB: Mini USB Color: Black Material: Plastic Package Contents: 1 x Voice Recorder 1 x USB Cable Note: Light reflection and different display settings may cause slight color variations between the image and the actual item. Measurement may vary by +/- 1-3 cm.