Cactus Heart Butterfly Time Teacher CAC 113 M04 Data Brand Citizen battery operating time: * 7 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: ±15 seconds per month (with no mobile link function) Other features 12 24 hour format Date month display swapping 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 finished in a durable stainless steel with gold plated stainless steel accents 29mm Case Size Plastic Case Silicone Strap