The Videofied SE651 exterior siren/strobe has been discontinued and replaced by the OSX601 model number.
The SE651 exterior siren/strobe is a battery operated, wireless combination unit that consists of a speaker and a strobe light. This siren produces an output level of 105dB at 1 meter for three minutes, in alarm. The strobe light flashes four times per second for three minutes, in alarm. The unit is typically installed outdoors on the premises structure to help responding authorities locate the alarm site.
The SE651 outdoor siren is powered by (4) D cell 1.5V alkaline batteries, which are included with this item. Typical battery life is four years under normal conditions.