Connect the Viking K-1500P-D desk phone to a single analog line. The phone is ready to receive calls with a built-in ringer, or to be used with a compatible ring down circuit. Set up the phone in a retail setting, for emergencies or any other use. The keypad-free design keeps people from dialing outside numbers.FeaturesAnswer only applications such as ring down, courtesy, emergency phoneCompatible with ring down circuits such as DLE-200B and DLE-300Connectivity - AnalogPower - Via telephone lineBell Ringer - Adjustable, 80 dB SPL @ 1m maximumConnections - RJ11 plug