Deltabell Plus External Sounder Module The Deltabell PLUS provides light to cover to provide around the clock visual deterrent A number of engineer friendly features; the unique levelling mechanism and modular components now make simple sounder installation a reality for you. 109dBa at 1M 3 Way tamper action Universal triggering inputs Supplied with rechargeable battery Low voltage / power consumption Engineer hold off Remote engineer hold off 3 Way tamper action – Activation from front back and power supply cut off ensures protection from sabotage attempts. In this situation the siren will activate independently of the control panel. Universal triggering inputs – Can be connected to any output on a manufacturers control panel positive applied negative applied positive removed negative applied. Supplied with battery – Complete with a backup battery so that even in the event of an intruder sabotage the bell box will still operate and protect the property. Engineer hold off facility – When first powered with the tamper switch open the sounder will not activate. Remote engineer hold off – It is possible to disable the bell box tamper when a control panel is in the engineers men