Product Description Velleman IR light barrier can be used to announce visitors, warn against burglars, set boundaries, science projects and more. It produces an audible (85 dB) and visible (LED) alert. It can cover a range of 1 m to 4 m. An on/off switch is provided. The power supply required for the transmitter is 9 vdc/50 mA maximum and for the receiver is 9 vdc/20 mA maximum. A 9 V battery holder and an adapter jack are included. Box Contains 1 x Velleman MiniKits Ir Light Barrier
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