A spy voice recorder is very useful when you need to discreetly record any conversation either at a moment’s notice or planned in advance. These devices are designed to be extremely unassuming and practical, usually disguised as a variety of everyday objects. Packed with a concealed microphone, a voice-activated spy recorder simply starts recording whenever sound is detected. If there's someone speaking, it immediately terminates its standby mode and it tapes what's being said. Professional recording pen chip of atj3315d, hd recording. Power on automatically and record tiringly by setting time. Agc function adjusts the noise source automatically. Detect low battery and save recording files automatically. Support vor voice activated mode. One key to record, support voice recording, and monitoring recording. Designed with built-in lithium battery and is also rechargeable. With usb 2.0 Connector making it easy to upload and download files. Recording time is up to 7 days. Monitor the recording in real-time.