"Product DetailsMaterial: Plastic Battery information: Contains non-replaceable button cell batteries Colour: Black FeaturesDigital display Light, mode, start and reset buttons Adjustable strap Additional InformationUsage Instructions:In the normal time display, press 'MODE' button three times to enter the setting mode. The seconds will flash. Press 'RESET' button twice, the hour will flash. Press 'START' button to advance the hour displayed. The watch will cycle through 12 hours with A displayed for AM time, 12 hours with P displayed for PM time, then 24 hours with H displayed for 24 hour time. Keep pressing the 'START' button until the desired time format and hours is displayed. Press 'MODE' button once to save the changes and return to the regular time display. Button battery safety information Warning: Button Cell Batteries are Hazardous (new or used). Keep away from children. Button Cell Batteries can cause severe or fatal injuries in 2 hours or less if they are swallowed or placed inside any part of the body. If you suspect your child has swallowed or inserted a button cell battery, call the 24-hour Poisons Information Centre in Australia on 131126 or in New Zealand on 0800 764 766 or contact your country's emergency department."