Ring signaler offers up to 95dB with various tone levels Bright strobe flashes along with signal tone to attract your attention Jack for optional ClearSounds SHK Vibrating Pad Wall or desk mountable Built-in dual modular phone jack for easy installation Requires an RJ11 modular phone jack and a standard 120V electrical outlet PLEASE NOTE: This will work only with an ANALOG telephone line. This will not plug into and operate on a multi-line and/or PBX phone systems.