Owain wrote:

I'd ask the seller for proper instructions, and if they can't supply
them then send the unit back. If it doesn't have English instructions
I'd be sceptical it was intended for the UK market or compliant with our
safety standards.

I agree entirely. If the manufacturer or responsible supplier isn't
providing clear instructions they are probably not complying with the
Electrical Equipment (Safety) Regulations 1994 (aka the LVD). The
matter should be drawn to the attention of the relevant local Trading
Standards department.

--
Andy