Locating a wall outlet to operate APH’s switch-adapted Vibrating Pad and switch-adapted Fan is a thing of the past. The DC Supplement Adapter is a battery-powered, dual-polarity output unit that allows users to operate DC-powered devices with APH’s Select Switch (battery-powered control unit) and with APH’s standard switches. Designed specifically for APH’s Vibrating Pad and Fan to be used with the Select Switch, the in-line switch in the cord allows the user to toggle between two output voltage polarities to accommodate many other switch-adapted toys and devices. The device has one receptacle to accept a switch plug.