Backchat® Speaking Alarm - 12-24vdc - Real speech alarm - CE marked - EMC Approved: E - IP68 - 2 year warranty bbs® tek White Sound® Alarm - 77-97 Decibels - Self-Adjusting - Sound confined to danger area - 12-24vdc - CE marked - EMC Approved: E - IP68 - Lifetime warranty "The safest alarms in the world due to their instant locatability & directional sound"