... HW-ZJ49 is a 999-channel wireless call server with stable wireless calling features, ... -105dBm HW-ZJ49 is a 999-channel wireless call server with stable wireless calling features, 433/315Mhz ... 3/4/6 key transmitters; * two display mode of call information : Cyclic display, not cyclic display; * Double ... backup technology, can put an end to call throw code, channeling yards and so on. * Four ...