อุปกรณ์ตรวจนับจำนวนคนผ่าน

Retro-Reflection type
Will make "ding-dong" sound or siren sound when the beam is interrupted
Speaker volume / time adjustable 
When in siren mode, sounding time is adjustable from 3 to 30 seconds
Sensing range:0.1-6 meters(22 feet)

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