Third-party certified to EN54-3 (Sounders) and 17 (Isolators) by the LPCB. Impressive 96dB(A) sound output @ 1m. Supplied with a BF431QCP quick connect plate and detector spur wires. Onboard short-circuit loop isolator. 550µA quiescent current. 5mA alarm current @24V DC (Sounder on max). Group addressing facility allows multiple devices to be operated simultaneously. 7 selectable volume levels and up to 15 selectable tone pairs. Optional BF330CTLIDW white or BF330CTLIDR red cap available for stand-alone use. IP21C rated.