Page Control - 6 Zone Talkback - 6 Zone talkback page control- Provides tandem all call- Background music input, automatically mutes in zone being paged- Page override for special priority announcements- Features are programmable per zone- Built-in tone generator for night ringing, time clock tone, doorbell- Accepts pulse and tone dial- Supports up to 2 talkback speakers and 40 one-way speakers per zone- Battery back-up input - UL listed- Access: page port on selected 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: 10lbs- Dimensions: 10.25"H x 13"W x 2.63"D- VALCOM POWER UNITS (+30)