Features: 1. Built in large capacity polymer safe lithium battery and AI intelligent power management system, reducing recording power consumption, and meeting your needs for about 24 hours of ultra long recording time. 2. Long distance recording, silent recording, during the recording process, silent and no light, USB flash storage function, built-in flash memory design, with strong magnetic free adsorption, at will. 3. Supports Android phone OTG connection, allowing you to play recordings on your phone and view upload management files at any time (Android phones only) 4. Automatic save/data protection, detects low battery level and automatically saves. A timestamp that records files named based on date and time, making it easy to search. The AGC algorithm balances the volume of the streaming media end to the ideal position, eliminating core issues such as low volume and high noise, and solving the fluctuation of volume for different groups of people after mixing with multiple people. Combined with a DSP noise reduction chip, it outputs high fidelity raw sound. 6. Voice activation function, intelligent voice control recording, recording whenever there is sound, stopping when there is no sound, file encryption protection, password addition for files, document management, to protect important recordings from loss. 7. Ideal choice for classes, lectures, meetings, interviews, etc. This is an excellent gift for teachers, students, lawyers, writers, etc.