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The AX-350TF is a 350' outdoor 4 channel select dual beam from Optex which has long range properties, and selectable beam frequencies that help to avoid unwanted crosstalk occurring over a long distance during multiple photo beam use. The AX-350TF outdoor dual beam comes with a spherical high grade lens, a clear viewfinder visibility, 99% stable beam blocking, plus a fine angle adjustment/alignment, and a 16 step LED indicator. The AX-350TF 4 channel dual beam also features frost and dew protection, synchronized pulsed beams, protection from rain, dust and insects, as well as an adjustable beam interruption time, and an AGC circuit. This exceptional dual beam has a durable structure with an IP54 rating, an anti-frost design that is well suited to locations that experience different changes in weather condition, and also comes complete with an optical pitch design for reducing accidental false alarms that may be created by unimportant objects.