This is a single 400W brushed chrome dimmer switch. 

The dimmer is a push on dimmer. It is two way and has a maximum capacity of 400W. It from the Varilight standard range of dimmers and is not LED compatible. 

Type: Dimmer
Sub-Type: 2-Way Push Dimmer
Finish: Brushed Chrome
Wattage (max): 400W
Gang: 1
LED Compatible: No

Code: HS3
Dimensions: 85Lx85H (mm)
£10.19 (inc. VAT)