Mains powered sounder
The mains powered Sounder connects into the alarm system, via a relay base or module such a the Ei428 or the Ei128RBU. If the alarms trigger, the relay will send out a signal that triggers the Sounder. The Sounder emits between the frequency of 340-2900Hz with 32 different tones that you can select and has an output of 90-100dB(A) at 1 meter.