Unparalleled recording quality: The newly upgraded L357 digital voice recorder uses a dynamic noise reduction microphone and PCM intelligent noise reduction technology to collect sound at 360; 7 levels of recording gain can be adjusted to capture farther and lower sounds; presenting you with 1536kbps crystal clear high-quality stereo. It is a practical gift for students, teachers, businessmen, writers, and anyone who likes recording.Ultra-fast charging speed: Equipped with a 500mAh battery and a Type-C USB cable, it charges faster, and can record continuously for 20 hours and play continuously for 35 hours after a full charge of 2 hours. Made of metal, it is exquisitely crafted, sturdy and durable. It is an upgraded professional recording device that can meet your needs for long-term high-quality and efficient recording.Simple operation and powerful functions: The recorder only needs 2 buttons: press rec to start recording; press stop to safely save the recording. You can choose recording in wav/mp3 format; support A-B repeat, play, rewind and variable speed playback; you can also set it to record by time period and automatically record to customize your recording plan. The optimized menu interface is clearer, providing you with more intuitive and efficient function navigation.Voice-activated recorder: Enable the AVR voice activation function, adjust the 7-level voice control sensitivity, record only when the teacher is speaking, capture the human voice clearly and accurately, and you will not miss any important details of the conversation. When no one is speaking, the recorder will stop recording, reducing silent clips, saving your playback time and disk space, and is widely used in classrooms, meetings, interviews, lectures and other occasions.Simple and efficient file management: The recording files are named after the specific time you start recording, which is convenient for you to quickly identify and find. The numbers in the file name correspond to year, month, day, hour, minute, and second in sequence. You can delete all recordings with one click, or transfer the recording files to your computer using the included Type-C cable. (Compatible with Windows and Mac)