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Product Overview Great for entry detection for store front safety sensor for garage doors overhead doors security sensor or other applications like offices schools warehouse vehicle detection etc. Retro-reflective design. Perfect for monitoring an entrance or use as an entrance indicator. Will make ding-dong sound or siren sound when the beam is interrupted. Speaker volume can be adjusted or turned off. When in siren mode sounding time is adjustable from 3 to 30 seconds. 9VDC adapter included. All components plug into each other. No hard wiring required. Includes NIR retro-reflective sensor reflector speaker and 9VDC 200mA output adapter.