The Multibox is available in two versions, standard and plus, to which you can add one of six individually shaped covers to meet your requirements. 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.The standard version has a single piezo sounder, with a sound output of 115dB(A) @ 1m with a wall and cover tamper protection. The plus version offers twin piezo giving 118dB(A) @ 1m with wall, cover and screw tamper and the option of SAB or SCB operation. Both are easy to install using a typical 5-wire connection, the option of trigger-wire monitoring for sounder and strobe is also available. Both versions have RED and GREEN comfort LED’s which flash at 1Hz and also act as diagnostic indicators.