... /433 Mhz Distance is about 100 M We sell cordless calling system for restaurants, coffeeshop, night club, supermarkets, shopping mall, store,hospital ... two hundred and fifty table is calling, the base display " 250 " ,and so on .the number will display on the base when ... first call,if anther table is calling,the display will change to anther table number, and the number will flashing,this means there ...