1.Wireless Calling System 2.Remote Control Range:500 meters; 3.Applicable places:hotels,restaurants,hospitals,cafes,factories, Wireless Calling Service System / Table Calling System / Hotel Service System:Main function:(1) The system is made up of one receiver, transmitters (HC & others just you like), one adapter, 12V 23A battery attached.803 receiver can match: HC Clear/page up/page down ...