... Mhz Distance is about 100 M We sell cordless calling system for restaurants, coffeeshop, night club, supermarkets, shopping ... 15 " ,if the two hundred and fifty table is calling, the base display " 250 " ,and so on .the ... display on the base when first call,if anther table is calling,the display will change to anther ... are more then one table is calling, you may push a button in the base to see which ...