Retekess Wireless Calling System Call Pager + T128 Watch Receiver + T117 Call Button for Restaurant 

link: bit.ly/2QOxG29
Applications:
Tea or coffee house, spas and salons, health and fitness clubs, restaurants, hotel conference rooms, executive dining rooms, Saloon, nightclubs, bowling alleys, massages house, churches, casinos, golf and country clubs, hospitals, health clubs, and offices.