Huber 180 ° white motion detector, recessed, plastered, energy efficient, red 0.50W, 230.00V

This switch does not fit the back box. I eventually managed to jam it, quite precariously and with a loose spacer, so I won't return it, but I am not happy. My complaint is not with the quality of the switch, which is beyond reproach. The problem is that there is no information about the suitability for sale in the UK. Any products sold from other countries should make it clear where they are designed for. I am not happy at all.