Details : - Viking universal paging interface - Select: FXO (loop start) FXS (ring trip) or paging port (VOX relay) interface mode - No power supply required in FXS interface mode - Up to 6 units can be powered from one adapter in the FXO or VOX mode - 30V DC talk battery for interfacing with FXO or unused phone system line input/trunk port - Floating 600 ohm paging output with volume control - Normally open or closed relay for external paging amp activation or interfacing the paging amp with an external background music source - 800 Hz pre-announce page tone (on/off) - Compatible with 24 to 48 volt FXS operation - Calling party control (CPC) detection for immediate disconnect - Busy signal detect disconnect - 2.5 to 5 second VOX silence disconnect timer - Programmable VOX trigger sensitivity - 16 or 36 second default disconnect timer - Screw terminal block connections - Wall mount housing: (2) #6x3/4 panhead screws included - Power: 12-24V DC @ 100mA 120V AC/12V DC @ 500mA UL listed adapter included (not required in FXS mode) - Dimensions: 111mm x 76mm x 36mm (4.38 x 2.97 x 1.38) - Shipping Weight: .48 kg (1.06 lbs) - Environmental: 0C to 32C (32F to 90F) with 5% to 95% non-condensing humidity - Relay Contacts: 30V DC@1A 110V [email protected] 125V [email protected] - VOX Minimum Audio Signal to Activate Relay: -30dbm minimum / -26dbm minimum @ 1KHz with VOX sensitivity switch at normal / lower positions - VOX Time Out Disconnect: 2.5 or 5 second - Default Time Out Disconnect: 16 or 36 seconds - Talk Battery: 30V DC VKFXI1 Warranty : 1 Year Warranty