The JSJSLW455 LightwaveRF 2 Gang Master / Slave Dimmer switch in Chrome is designed to operate with any master LightwaveRF Dimmer Switch to allow for situations like synchronising your downstairs hall lighting with upstairs landing lighting. The JSJSLW455SS Master / Slave Dimmer is suitable for two-way operation and installed in the same way as any standard light fitting using only a screwdriver. When the Slave Dimmer is connected to a master LightwaveRF Dimmer it can be wirelessly operated using any of the simple remote handsets from the LightwaveRF range; you can even use a Smartphone, Tablet or any other Web-enabled device to control your lights at or away from home with JSJSLW930 LightwaveRf WiFi Link (sold separately)* Radio Frequency: 433.9Mhz Electronic Transformer: Yes Dimmable LED: Yes Dimmable CFL: Yes Low Energy Halogen: Yes Incandescent: Yes Designed to operate with any master LightwaveRF Dimmer Switch (cannot be used as standalone) Synchronise upstairs landing and downstairs hall lights (two-way operation) Intuitive, easy to setup and use with other LightwaveRF\'s Dimmer Switches LED Status Lights: Amber (Off) and Blue (On)