It always is the case than an existing wall switch cannot be used as it was originally thought to due to structural changes or by shifting the furniture. Furthermore, the dimming of the lamps become much more pleasant than the normal switch on & off Simply replace the existing wall switch by the wall button obtained in the set with wireless receiver. It only needs to be connected to the existing cable (N, L, & switched L) at the receiver. Now the new button can be used as the old wall switch. This new button can also be in addition controlled by the wireless wall button included in the set or any other remote control of the RSL wireless switching system by the built-in wireless receiver. Simply attach this additional wall switch wherever you want by sticking or screwing. There can be no simpler way to change extpand or retrofit switches on dimming operation in the existing electrical installation.