There is a slight mark on the top plastic protective strip which I have shown in the last photo. This unit provides smooth fade free power, with the usual constant power out puts of 16AC and 12 DC volt on either side for accessory power.

Assembly Status: Ready to Go/Pre-built
Material: Pressed Steel
MPN: N/474
Control System: Analogue
Age Level: No Age Limit
Colour: Grey
Vintage: Yes
Brand: H&M
Type: Speed Controllers
Unit Type: Unit
Voltage: 230 V
Model: Duette
Country/Region of Manufacture: United Kingdom