Valcomft. s V-9933A is a self-contained device that continuously monitors the area and automatically adjusts the volume on the paging speakers. Use one per zone and/or one per noise area; Specifications: Input Impedance: 600 ohm; Power Requirements:-24 Vdc 100 mA; Shipping Weight: 1.1 lbs (0.50 kg); Dimensions: 7.3in. H x 4.7in. W x 2.1in. D(18.54 cm x 11.93 cm x 5.33 cm)
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