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The receiver will sound whenever the invisible infra-red beam is broken. Each pair features a coded infrared transmission and a switch for high or low power output. Both of the units require three AA batteries or a 6V plug-in mains adaptor each.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.