SmartSound PIR Motion Activated Audio Player Adopt passive infrared sensing technology. The detector/sensor can be rotated 60 at both left and right sides. Can change sound contents at will. Support memory function when power-off. Support to play MP3 audio files with high sound quality. Automatically trigger to play sound back. Load/change audio files through a Micro SD card(TF card), easy to operate. Built-in SPI flash as the internal memory. Sound volume is adjustable. Built-in 2W amplifier to ensure loud and beautiful sound output. Auto sleeping circuits design, which can keep long-term standby. Skill Level : Assembled and Tested