Unique Design: Mini voice recorder necklace. Ideal for lectures, reading, research, and evidence gathering. (Please charge before use). One-Button Operation: This voice recorder is incredibly user-friendly. Simply press the side of the USB port; a red light will illuminate, followed by a blue light flashing five times before turning off, indicating recording has started. Press the other side to stop recording. There are no visible LEDs during recording. Voice-Activated Recording: Recording starts automatically when sound is detected, preventing long periods of silent recording. Playback: The recorder is compatible with USB 2.0 PC and Mac. Turn off the recorder before connecting it to your USB 2.0 computer; otherwise, it may not connect successfully. This product is not suitable if your computer does not have a USB 2.0 port. Direct Time Setting: Connect the recorder to your computer's USB 2.0 port and create a \"txt\" file in the \"RECORDER\" folder, then save it. The file format and content must include the date and time. Ensure the \"year\" is four digits and the other digits are in the correct format, e.g., 20170101103030 (meaning January 1st, 2017, 10:30 AM).