Wrist Watch type caller host, worn on the hands of the service staff, the guests can call the waiter without moving the mouth and just do it. Low-level ambient noise. Vibration tips, long-distance, digital technology is safe and reliable. Use a no.7 battery. Operating costs at the end. It is necessary for hotels, hospitals, foot baths, spa cities, sauna cities and beauty salons. Effectively reduce the labor intensity of the staff, improve the service quality and upgrade the level.