Valcomft. s V-1095 easily connects to the amplifier output or anywhere on the 25/70/100 volt or 8 ohm/4 ohm line no costly amplifiers or heavy gauge cable required. endless expansion using valcom speakers/horns; Specifications: Input Impedance: 1.25 k ohm Two 20 k ohm; Output Impedance: 8 ohm; Shipping Weight: 1.1 lbs (.50 kg); Dimensions: 4.44in. H x 2.75in. W x 2.88in. D (11.28 cm x 6.98 cm x 7.32 cm)