The Simply Automated ZS24O-W is a universal button faceplate with 4 oval buttons. Simply Brilliant UPB Dimming Transceiver Switches provide ultra-reliable control of new and existing lighting fixtures, lamps and fans. Each unit has one switch that controls a single load of up to 900W. All rockers and buttons are transmitters and receivers able to communicate with UPB plug-in modules and/or other UPB devices to control virtually anything. Using a new digital protocol communicating over the powerline, Universal Powerline Bus (UPB) technology significantly improves the reliability of control applications in the home. Ultra-reliable digital UPB powerline control products by Simply Automated are now here at affordable pricing! Features no new wires, amazing flexibility, 99.9% reliability, 2-way capability and no noise interference issues.