Casio Mens AW 48HE 1AVUDF Anadigital Watch Guess battery operating time: 7 months mr. daddy 2.0 battery operating time: 7 months on rechargeable battery (operation period with normal use without exposure to light after charge) 18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) Accuracy Accuracy: ±15 seconds per month (with no mobile link function) Other features 12 24 hour format Day display (days of the week selectable in six languages) Hand shift feature (Hands move out of the way to provide an unobstructed view of digital display contents Auto calendar Resin Band Auto calendar (28 days for February)