This is a Georgian antique brass LED dimmer switch.
It is a single dimmer that is LED compatible. It can be used with dimmable LED lamps and bulbs. It had a maximum capacity of 10 LED lamps or bulbs and a maximum wattage capacity of 100W.
The V-PRO LED dimmer module used in this plate, also has different settings available. You can find out further information on the V-PRO module here.