Nfb Light Sensor (Model Aig20S)
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The NFB Light Sensor, model AIG20S, is a light probe designed for use by persons who are blind or have low vision. The NFB Light Sensor is a palm-sized unit. When a button is pressed, the sensor buzzes if it senses light. A higher pitch indicates more light. POWER: Uses two triple-A batteries (included). DIMENSIONS (HxLxW): 2.5 x 1 x 1 inch.