Unique hear-shaped Design , 12 hours battery life when fully charged, 90 hours maximum capacity. Great for conference,letcture, investigation, evidence collection.Having only 1 buttons, Just push the on/off button on the top , a red led on and then turn to blue led and off and the recorder will automatically start recording when it detects sound. there is no visible led during recording. It is both PC and Mac USB 2.0 Compatible. For playback, please connect the device to your computer USB 2.0 Port. Ultra small dimensions (34*36.5*11.7mm) - Conveniently fits in any pocket or purse for easy access and portability.Time setting: Please connect the recorder to the computer usb 2.0 port and create a "txt" file UNDER THE FOLDER RECORD, then save it. The format and the content of the file should include the date and time.