1Adopt PIR motion sensor detction technology, up to 4 meters. 2Integrating a variety of functions, exhibition hall corridor voice prompt,escalator reminder,subway/bank safety reminder advertisement promotion and so on. 3Wide detecting range. 4Load o files very easily, not need any assitant tool and software. 5Storage medium: Built-in SPI Flash, or insert SD card. This powerful infrared motion sensor speaker integrates a variety of functions, exhibition hall corridor voice prompt,escalatorreminder,subway/bank safety reminder advertisement promotion and so on. It adopts PIR motion sensor detection technology, up to 5 meters. Built-in 14W power amplifier circuit, it has perfect sound which is pleasing to our ears. And it supports two playback modes: sequential play in a loop and single playback. What are you waiting for? Features:Adopt PIR motion sensor detection technology, up to 5 meters.Integrating a variety of functions, exhibition hall corridor voice prompt,escalator reminder,subway/bank safety reminder advertisement promotion and so on.Wide detecting range.Load o files very easily, not need any assistant tool and software.Storage medium: Built-in Serial Peripheral Interface Flash, or insert SD card.Support maximum 2G SD card as storage voice carrier.Download o via USB flash disk.Support MP3 format o files.Support two playback modes: sequential play in a loop and single playback.10 levels of volume control, volume can be adjusted based on the actual occasions.Built-in 14W power amplifier circuit, perfect sound which is pleasing to our ears.Support SD card playback, SD card does not support hot swap, when there is no SD card, play the voice in Serial Peripheral Interface Flash;Built-in 5-30 minutes of the most competitive high-quality MP