As a spy recorder, small and discreet. Used for covert audio monitoring. The same size and appearance as a simple USB thumb drive. No mark indicates that it is a recording device. No light flashes during recording. Use as a hidden voice recorder in your pocket to secretly record real-time conversations. Used as a listening device to collect surveillance evidence about the treatment of relatives in nursing care. Used to gather evidence of bullying.Easy to use and charge-just switch and operate. One-click recording. It has complete functions, compact size, and only needs 2 hours to fully charge. Built-in rechargeable 110mAh lithium battery, supports 18 hours of continuous recording. Automatically save files: The recorder has a built-in intelligent battery detection function, which can automatically save the recording before the power is exhausted.