You probably have to shout your sales line in the past, not when there's sound ball that will get your message and offers across! Put your pre-recorded message into the SD card, plug it into the sound ball and the motion sensor will play the message when it detects presence. It will increase store sales by attracting customers and letting customers know what products you have. Or you can have it to play music to create the unique store's shopping experience. -Innovative product for POS application -All-in-one design, built-in SD card reader, MP3 player and Speaker for playing POS audio clips -Auto-start, auto-looping after connected power -Built-in motion detector, control auto power on/ off when detects motion -Card size remote control -Easy installation for different POS shelves