Features: brand new and high quality Built-in high capacity rechargeable battery, 3.7V 400mA. The voice recorder have high quality recording microphones with intelligent dynamic noise reduction, providing you with a full clear recordings and playback easily. Voice activated recorder for a business meeting, lecture class, conference, travelling, investigation or evidence. It's very small you can take it anywhere. It is very covert; real-time recorder. Specifications: Material:ABS Color:Black Built-in Memory: 8G,16G, 32G,(Optional) Size: Approx.100x35x12.5mm/3.94x1.38x0.49in USB 2.0 Port for Play Format: WAV, MP3 Recording format: Standard (SP) MP3 192KBPS Lithium Battery :3.7V 400mA Supported Operating System:Win 7/8/10 Signal Shielding:≧70dB Frequency Response: 20Hz-20KHz Operating temperature:-5 to 40℃ Package Includes: 1x Voice Recorder 1x Cable 1x Earphone 1x Manual note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.