https://folknoll.co.uk/products/general-alarm/ga-9005-111-general-alarm-beacon-sounder-green.html
GA042: Green Custodial General Alarm Beacon Sounder
IP65, green, combined beacon and sounder for Folknoll NOMS compliant general alarm and other custodial systems - alerts staff - indicates alarm source.
greencustodialgeneralalarmbeacon