LightwaveRF 2-Way Dimmers (LW450 / 452 / 455) are identical in appearance to standard LightwaveRF dimmers. They act as ‘slave’ switches in a 2-way circuit (circuits with more than one switch such as hall and landing lights). Up to six 2-way dimmer gangs can be connected to one master LightwaveRF dimmer switch, either directly or in a 'daisy chain'. This method negates the need for intermediate switches. Please note: LightwaveRF 2-way dimmers cannot be used in conjunction with a standard light switch.