Valid e-Passport with an Electronic Chip
Biometric Passport Requirement
Citizens of the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Slovakia and the Republic of Korea must be in possession of an "electronic passport" to enter the United States visa free under the Visa Waiver Program.
An e-Passport has an integrated computer chip that holds the same information printed on the passport's data page. These e-Passports must comply with international technical standards established by the International Civil Aviation Organization (ICAO). You can identify an e-Passport with the symbol below on the passport cover:
Please examine your passport carefully to determine whether it has this symbol. If you have any doubts, please check with the passport-issuing agency of your country of nationality.