Patlite bm-212h+fc001 panel mount smart alert alarm, 2 sounds, dark gray, ac120v the bm smart alert’s small size (30mm diameter) and two alarms make it ideal for installation on control panels or production equipment. features: built-in alarm: audible sound up to 90db at 1m sound pattern: selectable 2 patterns of alarm sound body: compact and light weight (100g) npn/pnp compatible: 24v type only ce compliant: for 24v ac/dc only