It's simple! Once you've downloaded the CLEAR pass for CPB Mobile Boarder Protection app, build your profile by taking a selfie and scanning your passport any time before your trip. Then, create a trip that you’ll use to go through U.S. Customs and Border Protection. After you submit the trip within the app, you will have up to 4 hours to go through the mobile passport control line for U.S. Customs and Border Protection. You also have the option to create a trip and set a reminder to activate that trip for later when you’re ready to go through U.S. Customs and Border Protection at your destination.