Spec Sheet Preview: The Alpha Communications® VV100D DTMF Input Boards are used for a variety of applications. The primary use is for providing a filtered telephone line input to the model VVDTMF board. The VV100D is powered from a separate 12VDC plug-in power supply (model SS12P or equivalent). The VV100D boards are designed to easily surface mount right onto the finished wall by using the mounting holes provided for screw mounting, along with the provided plastic stand-offs. Connections are positive screw terminal and p …