You are buying a 14$ Skype credits voucher code. It works worldwide, for example, Euro based accounts will be credited around 12€.
The voucher code will be sent once you open the trade.
To redeem your Skype Credit Voucher:
1. Visit www.go.skype.com/voucher.
2. Sign in to your Skype account (If you don't already have an account, you'll be prompted to create one).
3. Copy and paste, or type your credit voucher into the box provided.
4. Tick the box "I agree to the Skype Terms of Service" and then click "Redeem voucher or prepaid card".