Recorder, Sound Collector, Stereo Microphone Equipped, Long Recording, 260mAh Battery MP3 Player Function, Recorder A-B Repeat, Recording Start Timer, Auto Power Off For Meetings/Business Negotiations/Lectures/Interviews/Language Learning/Interviews/ Harassment/Telework, etc.! I bought it about two years ago, but I ended up not using it. (I opened it and practiced the operation) I don't have a chance to use it now, and I don't know how to use it. The power came on when I charged it. Please, someone who can use it. ★No instruction manual Compatible Devices: MP3 Player, Computer Brand: Joyteco Hardware Interface: USB Microphone Waveform Rate: Built-in Format: MP3 Audio Headphone Jack: 3.5 mm Number of Batteries: 1 Lithium Polymer Battery Product Dimensions: 10 Depth x 30 Width x 103 Height mm Memory Storage Capacity: 32 GB Item Weight: 88 grams