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This wireless transmitter call button is 433MHz;have Three key: Call, Cancel, Pay; has sticker,can be fixed on the table ;the emission range can reach 500m in open area;bulid in 12V 23A battery ;modulation modeis ASK (AM);the working chip is learning code, can use in 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

$3.99~$12.99