I run with this switch my aquarium lighting, so I do not have to turn itself mornings and evenings. This works great and it is not perfect switches at the set time for me and also for my fish, irrelevant. If someone comes to very precise circuit, but I guess a more accurate product.
+ Very cheap to buy
+ Simple setting
+ Outside the switching points completely noise-free (although the timer is mechanically operated)
- Peels not perfect at the set 15-minute intervals (in my case, for example, instead of 21:00 at 21:06)
- If you move an audible clicking sound (it does not bother me, the time switch operate in the bedroom!)
I can wholeheartedly recommend to anyone who does not wish to highly accurate circuit on this product!