Page port pre-amp / expander. Pre-amplifies low level audio to remote sites. Provides virtually unlimited expansion for any system (150 Valcom one-way speakers per VC-V-1094). Master volume control for entire system or groups of remote speakers. Isolates page port from speaker lines. Output impedance: 600ohm. Power requirements: -24 Vdc, 45 mA. Weight: 1.1lbs. Dimensions: 4.44"H x 2.75"W x 2.88"D. VALCOM POWER UNIT (-1). VCV1094A.