#1	Retroreflective design
#2	Perfect for monitoring an entrance or use as an entrance indicator
#3	Will make dingdong sound or siren sound when the beam is interrupted
#4	Speaker volume can be adjusted or turned off When in siren mode sounding time is adjustable from 3 to 30 sec
#5	RetroReflective Alert System comes with the following NIR retroreflective sensor reflector Speaker 9VDC 200mA power adapter 6ft cable