You loose the right to change your mind and return the goods without any reason given, but of course you still have warranty of 6 months; if anything breaks with the product in that time, you can request the seller to make up by offering a repair, replacement, or refund (whatever they deem most appropriate), and while the seller can contest that, they are obliged to prove it’s your fault, not theirs. After that timeframe, this obligation reverses.