The sounder base unit is housed in a 3mm poly-carbonate case and has an inner cover of 1.5mm SAN to protect the electronics, battery and strobe. It has a single piezo sounder, with a sound output of 115dB(A) @ 1m with a wall and cover tamper protection. It is easy to install using a typical 5-wire connection, the option of trigger-wire monitoring for sounder and strobe is also available. It has RED and GREEN comfort LED’s which flash at 1Hz and also act as diagnostic indicators.