Shipping about 20 days. Apparently, this device has a special place for installation in Viomi refrigerators, but it does not interfere with putting it in any other refrigerator) I glued on the wall on a thick rubber double adhesive tape. Be sure to be thick so that the holes on the back of the device remain open. The smell of mustard from the device is not strong, and quite pleasant, but it is felt only if you breathe through it) so the smell in the refrigerator will not be.
The freshener arrived 10 days before St. Petersburg. It is difficult to say by efficiency, never used such things, but odors adsorb-this is for sure. Not completely, it smells a little chemically