Ir light barrier
Includes transmitter (2.1 X 1.6) And receiver (3.9 X 2). The kit transmits a light beam between the transmitter and receiver up to 4 meters. When the light beam is interrupted the kit makes an audible noise (85db). The transmitter and receiver, both require a 9v battery (not included). Omes with battery holders and adapter jack. Kit comes with complete parts and instuctions.
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