Unique keychain design, maximum capacity 90 hours. Very suitable for meetings, speeches, investigations, and evidence collection.With only 1 button, this recorder can be used by less experienced users. Just push it down to the USB port side, and you will see the red LED light up, then the blue LED flashes 5 times and then goes off, and you are now recording. Push it to the other side and you have turned off the device. There are no visible LEDs/lights during recording. (If you don't see the LED indicator after turning on the device, please charge it.)It is compatible with PC and Mac USB 2.0 at the same time. To play, please connect the device to your computer's USB 2.0 port. If your computer does not have a USB 2.0 port, please do not buy it.Size (60mm*32mm*18.6mm)-It can be easily put into any pocket or purse for easy access and carrying.Time setting: Please connect the voice recorder to the USB 2.0 port of your computer and create a "txt" file in the folder record, and then save it. The format and content of the file should include date and time. Please make sure that the "year" must be four digits and the rest are two digits.