The V-9934 provides remote noise sensing for the V-9933A and features a Self-contained microphone and pre-amp Phantom powered. No power supply required. Screw terminals provided for all connections Up to four units may be paralleled on one V-9933A Uses CAT3 twisted pair telephone cable (one pair ); Shipping Weight: 1 oz (0.03 kg) Dimensions: 2.9in. H x 1.5 W x .81in. D (18.5cm H x 11.4cm W x 5.1cm D)