Order as many ENV-253SD packages as needed to go with the ENV-253 or ENV-256I controls. This item consists of two parts. The first is a single infrared light source housed in a 0.75" (1.9 cm) diameter plastic cylinder with two holes for mounting screws and two-conductor cable. The second is a single infrared detector, or receiver, housed in a similar aluminum cylinder with a three-conductor cable. Individual ENV-253SD source and detector units may be placed from 0.25" (6.4 mm) to 30.0" (76.2 cm) apart under most conditions.
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