1,[Multi-functional Convenient] It's a pendant/ charm/ keychain, or a mini recorder, hang chest/ hang backpack/ hang key, small and mini, waterproof and dustproof, hard and durable shell. 2,[One-Key Recording] Record on, save off, no light, no sound, silent recording, voice-activated recording, intelligent voice-activated design with sound recording, no sound automatic pause to effectively save memory and power. 3,[Intelligent Noise Reduction] Clearly restore the human voice and then the noisy environment is not afraid, built-in dual-core noise reduction technology, according to different recording scenarios automatically reduce environmental noise, so that the human voice conveys clear details. 4,[Support cell phone OTG playback] Comes with a special headset, the second into MP3, recording can be directly plugged into the headset operation to listen to the recording, listen to music, play / pause, up and down the song, file deletion, etc. .... Can connect OTG to cell phone file import, export, etc... (Only support Android phones) 5,[Multi-scenario Applicable] Suitable for interviews and forensics/meeting records/teaching lectures/business talks, etc. ..... Recording format: WAV USB: mini USB2.0 Microphone: condenser dual microphone core microphone Memory capacity: 16G Colour:Black Material:plastic Package Contents: 1 x Recorder 1 x Charging cable 1 x Wired earphone 1 x Lanyard 1 x English Manual Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.