Casio Vintage Unisex Watch MTP B185D 1A Mineral Glass Classic Design Stainless Steel Adjustable Band mens fashion battery operating time: 8 months Accessories battery operating time: 8 months on rechargeable battery (operation period with normal use without exposure to light after charge) 19 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) It is functionally equipped with a digital display function of the LCD to display tidal and moon phase data Power supply and battery life send back to us the item and we will refund or replace your item