Intelligent voice control: Record when there is sound, automatically pause when there is no sound, effectively save memory space to filter invalid clips and reduce playback time. Noise reduction technology: software and hardware matching, system optimization and upgrade, layer-by-layer noise filtering, audio noise reduction technology outputs clear human voice. Automatic saving when power off: intelligent superposition technology, automatically overwrite previous files when loop recording storage space is insufficient. Remote recording: high-definition long-distance omnidirectional stereo pickup technology, high-definition long-distance 100M, not limited by the environment, listen and record at the same time. Intelligent timestamp: built-in time chip, convenient for recording file generation time and end time, convenient for browsing and finding files. Lossless music playback: plug in headphones and turn into MP3 in seconds. Support lossless format music, relax your body and mind in your spare time and accompany you on business trips. Name: Keychain Voice Recorder Recording method: Boot recording, shutdown saving battery: Eco-friendly polymer lithium battery Chargingtime: About 1 hour Recording format: WAV Playback format: MP3/WMA/WAV 4GB: Can be stored for 48 hours Sample rate: 48KHZ Recording bit rate: 192KBPS Size:66x25x11mm (without keychain) Color:Black Material:Metal Package Contents: 1 * Voice Recorder