Pen Voice Recorder with MP3 Player: Features: 1. dual micro support music/voice playing outside 2.8 core noise reduction stronger noise reduction ability. 3. High sensitivity recording longer voice distance 4. One-key recording automatically save the recording file when power off 5. Support timing recording segmented recording 6. Automatic time stamp function which can effectively preserve evidence. 7. Support A-B repeat function fast forward and rewind playback 8. Support recording while listening 9. Support U disk function can delete files locally 10. 20 hours of continuous recording 11.The product itself has no built-in memory you need to insert an sd/tf micro card which supports expansion to 256gb. Package included: I* Recorder 1*usb cable 1*earphone 1*english instructions Playback Formats:mp3,WAV,WMA Record Audio Format:MP3,WAV,WMA Origin:Mainland China External Memory:Yes With Speakers:Yes Balanced Out:Yes Model Number:Q55 mp3 player voice recorder Package:Yes External Microphone:No Certification:CE Dimensions (WxHxD):85*27*11(mm) Voice Activated Recording:Yes Recording mode:high definition recording format:WAV Memory card type:Expansion card not supported display:HD screen Transmission interface:USB 2.0 Microphone:two-way Recording distance:5-10m videotape:Video capture is not supported Battery:lithium battery Shell material:kirsite