Mini PIR Motion Activated Audio Player Small and exquisite with mp3 high quality audio output. Equipped with a pir motion sensor to trigger audio playback, and detection range can be up to 4 meters. Uses micro sd card and internal flash memory for the storage devices(choose one of both). Reads audio files directly from micro sd card. Incorporated a 2mb flash as the standard internal memory(supports max. 8mb flash memory). Supports to load/copy audio files from micro sd card to flash memory, very easy to operate. Supports two triggering modes: all loop repeat mode and single repeat mode. Two-level sound volume adjustment. Supports two power supply modes: 3 pieces aaa alkaline batteries or an external power adapter through the micro usb port. Dimension: 60*90*26. 60mm. Skill level : assembled and tested.