How many light switches can you have as a slave from the circuit light switch?
You can have up to six slaves working off one master switch, providing it is within 100 metres of cable. This means up to six way switching is possible.
What range do the remote controls work at?
The products operate on 433 frequency and you will get between 15-30 metres in all directions from a hand held controller talking to a receiver such as a light switch or socket. The same applies to the Wifi Link, 20 metres in all directions. If there is ever a problem you can buy a battery operated signal booster.
Will this system work in granite properties? Does it affect the signal at all?
Yes, it will work, however you may find the range is affected.