Mengshen Infrared Detector Doorbell Door Bell Welcome Alarm 32 Music Switch IR Motion Sensor MS-YBQ01White This product can be used in market, store, supermarket, boutique, photo studio, optical shop, toy shop or any places need to welcome the guests or customers. It can be used for theft prevention. It also can be used at home and office. Sounds language in Chinese (Hello, welcome, Dingdong and 16 songs) Remote control 0-15 meters, high sensitivity, used in dark place