Features: Password protection; long battery life with built-in rechargeable environmentally friendly polymer battery. Timestamp function automatically names recording files by date; high-definition noise reduction technology automatically adjusts to the noise source. Supports voice-activated recording, voice recorder, MP3 player, and USB flash drive functionality. Detects low battery and automatically saves recording files. Compatible with headphones for music playback; USB connector allows easy file upload and download. Housing made of zinc alloy and faux leather material provides strong anti-fall protection. Keychain voice recorder set includes only the items listed; other accessories shown in pictures are for demonstration and not included. Specification: Name: Keychain Voice Recorder Recording method: Records when powered on, saves when powered off Battery: Environmentally friendly polymer battery Charging time: Approximately 2 hours Recording time: Up to 25 hours Recording format: WAV Playback formats: MP3, WMA, WAV Storage capacity: 4GB model: Stores up to 48 hours of recordings 8GB model: Stores up to 48 hours of recordings 16GB model: Stores up to 48 hours of recordings 32GB model: Stores up to 48 hours of recordings Optional built-in memory options: 4GB, 8GB, 16GB, 32GB Material: Zinc alloy and faux leather Size: Approximately 7 x 3.4 cm / 2.76 x 1.34 in Color: Black Power supply: USB charging Quantity: 1 set Note: No retail packaging included. Please allow 01 cm variation due to manual measurement. Ensure you are comfortable with this before purchasing. Due to differences in monitor displays, the actual item color may vary slightly from the image. Thank you. Package Contents: 1 x Keychain Voice Recorder 1 x USB Charging Cable 1 x User Manual 1 x Packing Box