Hot-Line Dialer Network, Touch Tone. 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! Applications 20 digit programmable speed dial number Touch Tone and 10/20 pps pulse dialing Operates on standard C.O. lines, Centrex lines, or analog stations behind key systems and PABX's Non-volatile E2 memory (no batteries required) Won't dial on incoming calls Programmable security code Touch Tone programmable One year warranty Made in the USA Features Security and emergency phones Interactive point of sale displays Interactive voice response systems Catalog sales Automated Teller Machines (ATM's) Replace leased ring down circuits Hot-Line reservation phones for hotels, airlines, car rentals, etc.