On 2 Nov, 13:16, "Toby" wrote:
"Ray" wrote in message

I bought 3 x wall mirrors with shaver sockets for the bathrooms and they
all hum, whats causing it ?

The transformer for the shaver socket.

Isn't the power to these things usually switched by a switch that's
activated when a plug is inserted into the socket? This is a
deliberate measure to avoid them humming, and a reason why you
shouldn't leave shavers & toothbrush chargers plugged into them
permanently.