Designed for interior use, CSN27U12V Indoor CyberShield™ FTTx System supplies continuous 12 VDC to local power network interface devices (NID), cable telephone modems, wireless base stations, fiber to the home (FTTH), optical network terminals (ONT), and integrated access devices. Features of the CSN27U12V include high-function design, cold start functionality, audible alarm signals with silence options, microprocessor intelligent control, a telemetry interface, optional extendable runtime, user-replaceable batteries, and LED indicators. It also comes with a three-year warranty.