Check the listing for details. Valcom V-2003AHF Page Control - 3 Zone Talkback. Condition: New. Listed at 590.95 USD. 3 Zone talkback analog 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 mAPower requirements: 230 Vac/.5A or 120 Vac/1AWeight: 6.25lbs Dimensions: 7.1"H x 10"W x 3"D VALCOM POWER UNITS (+10)