Adapter works just fine

I bought this for my plug E-Reader, as it is pretty small and cheap. The shop always works without problems (the Kobo asks when plugging if I invite or connect want). 1 star deduction I admit, however, since the connector is a humming / buzzing noise from when he plugged into an outlet. This is, for example, if it is a bit irritating at the head end of the bed, on the other hand, the buzzing is also pretty quiet, so it would many might not hear (and if the book is exciting not anyway).