It contain 1 receiving message host, and 1--99 pcs emergent buttons according to your need.
The host can exactly discriminate and show 99 different calls from the emergent buttons .
When user press the emergent button , the emergent call will be send to the host and the management center can see which specific location the call come from , then offer help without delay .
Proper to be used in hospital, hotel, meeting room, hall, supermarket, travel place point, ect to deal with emergent call from clients in time.