According to the law on consumer protection goods can be returned back to the store within 14 days, but the law has weight restrictions. In particular, non-refundable slozhnotehnicheskie goods, which are defined as any electronic device.
Fortunately, many large stores set their own rules for a refund, which is much more humane than those prescribed by law.
So Leroy Merlin can return anything, for 100 days.
On the title pictures you can even see someone returned a flower in a pot. On the right - a bag with my lights. :)
Auchan takes the goods back within 30 days.
Both stores refer to the law, so the return of goods slozhnotehnicheskih prinitspe can cause problems, but I one was returned to the Auchan headphones open box, blister, which were really awful at a fairly high price.
Before any goods taken back and Yulmart Ftsentr. As it is now I do not know.
But in Metro the other way around any refund (even legally) runs from a fight.