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By certification 
Outdoor Long Distance Sensor
Item# LK-160HQ
Detection range: outdoor 160m (530ft)
LED level meter for beam alignment. Three LED on the Receiver act as a level meter to visually display the beam reception level. Total 10 level LED indicator enables quick and accurate beam alignment.
Beam interruption period 50 to 700 m-second adjustable.
Form C relay providing more applications.
See details at www.garrison.com.tw
Specification:
http://www.securitygarrison.com/
