Ⅰ. Lecture Recorder with Playback Meeting, Interview, Mini Recorder, USB Charging, MP3 16GB Digital Voice Recorder with Playback Recorder for Lectures, Meetings, Interview, Mini Recorder, USB Charging, MP3 Ⅱ. Specification: Color: Black; Material: Zi-NC alloy metal body; Screen: 0.8 inch IPS (buttons: touch buttons); Battery: Lithium-Polymer; Memory: 4GB / 8GB / 16GB / 32GB / 64GB / 128GB (with memory card); Product Dimensions: 11mm x 27mm x 85mm / 0.43 x 1.06 x 3.35 inches; Package Dimensions: 14.3 x 8.8 x 4.3 cm / 5.63 x 3.46 x 1.70 inches; Total Weight: 160g / 0.35 pounds Ⅲ. Zi-NC metal alloy body design, mirror plate, technology and texture combined into one, one-click recording, one-click recording on and off, simple and convenient to use, anti-physical, emergency recording will not miss the recorder, side sliding, press up to record, press down to save panoramic dual microphone, stereo surround sound recording, built-in high-sensitivity condenser dual microphones, 360-degree stereo surround sound recording and sound quality playback. Ⅳ. Password Protection: You can set a password to protect your data so that others cannot listen to the recordings unless they decrypt them. Ⅴ. Direct OTG mobile phone connection: No need for a computer, direct connection to Android mobile phone via OTG.