Mini Hidden Audio Recorder Voice Activated Listening Device Keychain MP3 Player — Intelligent Noise Reduction: PCM ten-core digital intelligentnoise reduction, filter noise automatically to get clearer soundMini Hidden Audio Recorder Voice Activated Listening Device Keychain MP3 Player Features: 1. Recording Method: One-Key recording/saving 2. 8GB Large Capacity: Store 96 Hrs of recording files 3. Advanced Chip: The professional voice recorder chip for HDrecording 4. Long Battery Life: Fully charged in 1Hr, recording for 25Hrs, standby for 30days 5. Time Stamp: Recording files are named according to date and it is easier to find out 6. Intelligent Noise Reduction: PCM ten-core digital intelligentnoise reduction, filter noise automatically to get clearer sound Specifications: Product Name: Keychain Voice Recorder Material: Metal and Titanium Alloy USB Interface: USB 2.0 High Speed Built-in Memory: 8GB Support System: Windows/Mac Music Format: MP3/WMA/WAV Charging Time：1Hrs Recording Time: 25Hrs Standby Time: 30 Days Size: 83*25*11 mm Package Content: 1 x 8GB Voice Recorder 1 x Earphone 1 x USB Cable 1 x User Manual