Professional noise reduction & upgraded sound quality: Equipped with a professional noise reduction chip and dual sensitive dynamic built-in microphones, the newly upgraded digital noise reduction recorder could record up to 3072 KBPS stereo recording, bringing you an excellent playback experienceSimple operation & voice activation: L15 is easy to operate and very user-friendly. Common functions such as recording, saving, and playback can be completed with only three buttons. And you can choose AVR mode (record only when audio caught), which can effectively save your storage space and time. It is very suitable for conferences and classrooms, lecturesLarge memory & easy file management: The built-in 16GB memory can store 1160 hours of recording files, and it also supports up to 64GB of extended memory (TF card),All recording files are named by timestamp. You can easily backup recording key files or download files by connecting to computer with attached USB cable, which is convenient and fastLong battery life & password protection: The fast-charging rechargeable battery can be fully charged in two hours. And it can record 20 hours of continuous recording when fully charged. The recorder has a low-battery auto-save file function and password protection to ensure the safety of your personal files