Easy to Operate & Powerful: digital recorder just 2 buttons: press rec to start recording immediately; press save button to save recording. You can choose the recording format as wav/mp3; voice recorder with playback support A-B repeat, playback, rewind, and variable speed playback; can set to record in time slots and auto-record to customize your recording schedule. The optimized menu interface is clearer and provides you with more intuitive and efficient navigation of functionsMemory Doubled-64GB High Capacity: L357 small audio recorder (3.86x1.2x0.47 inch) can store up to 4660 hours of recording files (32Kbps); configured with 500mAh battery and Type-C USB cable, faster charging, 3 hours fully charged for 32 hours of continuous recording and 35 hours of continuous playback. Made of metal, beautifully crafted, and durable, it is a professional recording device that is constantly upgraded and can meet your needs for long-term high-quality and high-efficiency recordingVoice Activated Recorder: Enable AVR voice activation function, adjust 7 levels of voice control sensitivity, recorder for lectures only when the teacher is talking, capture human voice clearly and accurately, and won't let you miss any important details of the conversation. And the recorder will stop recording when no one is talking, reducing silent segments, saving your playback time and disk space, widely used in classrooms, meetings, interviews, lectures, and other occasionsPre-Sales & After-Sales Service: lf you have any problems with your recorder, such as disk error, please refer to page 15-19 of the manual for troubleshooting, and feel free to contact us through Amazon, we will reply to you within 24 hours to ensure that you have our guidanceSimple and Efficient File Management: The recording files are named by the specific time when you start recording, which is easy for you to identify and find quickly, and the numbers of the file names correspond to the year, month, day, hour, minute and second in order (YYYY-MM-DD-HH-MM-SS). You can delete all recordings with one click or transfer the recording files to your computer with the included Type-C cable. (Windows and Mac compatible)