How often does the atomic clock check itself, is there an on/off feature?

Hello, This unit checks in with the Atomic Signal periodically throughout the day to ensure the split-second accuracy of the time and date. The Atomic Clock feature cannot be disabled. If you have further questions or concerns, please reach out to our support team via live chat or email request on the AcuRite Support website. Have an amazing day! Haylee AcuRite Support Team