Even a small defect despite quite a hassle

Purchased to control a remote bedside light: works fine, no complaints.
However I have used it on a garland of Led 20m, but to my astonishment, a very low electrical power continues to flow into the outlet and thus leaves a faint glow in the led, fairly average if the secondary objective also to save money.

As struggling in themselves, apart from a small clicking sound when you press on / off and a resistance to connect electrical appliances, are satisfactory (the finish and color seem worse than images true)