The XPander Sounder and Sounder Base is a wireless and designed to be used with XPander detectors and manual call points.
 
XPander sounders can be wall or ceiling mounted and use a bi-directional monitored radio platform to communicate. They feature 32 selectable tones, including the Apollo tone, and a self test which causes a fault signal to be sent if the sounders fail to operate. The self-test feature is activated by a DIL Switch. Individual parts may be ordered separately.