Special Instructions: Use alkaline batteries. First put the batteries into the clock and let the hands spin to 12, 4 or 8. Then waiting for it to get the signal. Once gets the signal it will be set to Pacific time. If you are not in Pacific time, hold the time zone button 3 to 5 seconds for the clock to correct itself. Keep the perfect, most accurate time with this stylish 10" atomic wall clock. It uses one "AA" battery and is very simple to use - simply insert the battery and press your time zone button, then hang on the wall.