This versatile unit, in the same-sized case as our K3507 tone ringer, replaces the Type-C Alarm. There is provision for two exchange lines via separate RJ11 sockets. Four different selectable alarm-tones are provided for each exchange line. All other connections to and from the unit are via screw terminals. Requires K3505 horn speaker. Other peripheral devices such as strobe lights, PIR sensors, doorbells, reed-relays, PA amplifier inputs etc can be connected. Supplied with a 12V DC�power supply which is also used to provide 12V power for strobe-light operation. The maximum volume of the Universal Loud Sounding Alarm in conjunction with our K3505 Horn Speaker is 110dB. The unit has a REN of 0.1. Dimensions 115(W) x 155(H) x 35(D)mm.