The only clause is that the item must not be used or taken out of its sealed outer packaging. As long as the item is still in it's sealed packaging when it's returned to us and there are no signs of tampering then the product will be taken back into stock.
I see potential problem with this because some devices like ledgr nono X have higher percentage of devices that have some problems with battery, and few other issues.
That means you can't know if something is wrong with purchased hardware wallet until you open it and plug in power source for charging, than you can see it's not working like it should.
You can check out ledger reddit channel and see people are complaining all the time about this, and ledger support is replacing this devices all the time.
For cases of defective or damaged products we still offer the refund under the condition that the fault is readily apparent when we receive the item back.
Is bad battery (inside ledger X) counting as defective and damaged product?