The K-1900-6 Hot-Line Dialer and Network fits most 500, 554, 2500, and 2554 sets. Once installed, the phone will dial a pre-programmed number each time the handset is lifted.
For a vandal resistant Hot-Line phone, the K-1900-7 is available. If a keypad is required, the K-1900-8 is available. If a dialer is not required, the K-1500-7, K-1500P-D and K-1500P-W are available!