I purchased this on October 20th at my parents' request, but they didn't like it, so I'm putting it up for sale... I only opened the box, and the main unit has not been used at all, so I haven't checked the operation. (The paper box has a few initial scratches.) The main unit is small and discreet, and it seems you can listen to the recordings with earphones. It also seems to work when plugged into a smartphone, which is good for gathering evidence or studying, and it's easy to carry around, making it very convenient. Why don't you give it a try? I will carefully package it to prevent water damage. 【Product Specifications】 Capacity & Weight: Approx. 47*30.5*6.8mm, 15.2g Battery: 200mAh Charging Time: 1.5 hours (when fully discharged) Continuous Recording Time: 30 hours Continuous Playback Time: 20 hours Recording Storage Time: 64GB: Maximum 4552 hours of recorded data storage ーーAccessoriesーー Instruction manual Neck strap Earphones USB cable (Type C) USB adapter (Type C) Main unit (Type C) QZT Electronics Study Infidelity investigation Power harassment Small Voice recorder Evidence