Locate the time zone switch on the back. Slide it to your region: P (Pacific), M (Mountain), C (Central), or E (Eastern).
If the clock is showing the wrong time, you can manually trigger a signal search: Press and hold the button for 3 seconds . ch-899 chouchin radio controlled clock manual
For the best results, set up your clock in the evening when radio signals are strongest. Locate the time zone switch on the back