For more information about the YubiKey NEO, see the product page. The product page provides information on the features of this YubiKey.
For more information about the YubiKey NEO-n, see the product sheets on our Documentation page. We are withdrawing from our retail web sales the YubiKey NEO-n. Throughout 2016, we will continue to sell this product to existing customers and partners at existing price/functions, for deployment in enterprises, but it will not be available on the Yubico Store.