Page Control - 3 Zone Talkback- 3 Zone talkback page control- Provides tandem all call- Background music input, automatically mutes inzone being paged- Page override for special priority announcements- Features are programmableper zone- Built-in tone generator for night ringing, time clock tone, doorbell- Accepts pulseand tone dial- Supports up to 2 talkback speakers and 40 one-way speakers per zone- Battery backup input- UL listed- Access: page port onselected telephone systems, PBX loop start or ground-start trunk port, electronic or 1A2 line key (line card required), or dedicated single line phone set- Input impedance: 600 ohm- Music source impedance: 4 to 600 ohm- Music input level: -10dBm nominal- DC output: -24 Vdc @ 500 mA-Power requirements: 230 Vac/.5A or 120 Vac/1A-Weight: 6.25lbs- Dimensions: 7.1H x 10W x 3D- VALCOM POWER UNITS (+10)VCV2003AHF