A little tediousness.

At what rate do these ledger vouchers contain BTC? By the time of delivery, bitcoin rate will change and the fixed 20$, 30$ and 50$ will already become less or more (this moment is not so bad). Or maybe the voucher automatically adds BTC at the current rate from the moment the redemption code is entered? In any case, there is less than a day left to find out (and limited supplies).

It should be added that the promotion (Source) is valid only for specific hardware wallet models (not all body colors will be available):
Ledger Nano S Plus Matte Black 
Ledger Nano X Onyx Black 
Ledger Nano X Onyx Black + Ledger Recover   
The Ledger Nano Duo (Are there only black options here too?)