8-Digit Calculator, Constants for addition, subtraction, multiplication and division Water Resistant (hand washing or splashes of water only, not suitable for swimming, diving or submerging in water) Dual Time, Daily Alarm, Hourly Time Signal, Auto Calendar Battery CR2016, Approx. battery life: 5 years Size of case/total weight 42. 0 x 33. 0 x 8. 40mm / 29g