Movie Black&red Dial Deadpool Mask Quartz Pocket Watch Necklace Chain Pendant Mens Womens Xmas Gifts This is quartz pocket watch with battery. It is okay to dip some water ,but don't wear it to swim,dive,bath or put it under water Set the time: Please pull out the crown to position B to adjust the time,then press down to A position.It will work. Replace the battery : Use tool to open the back cover,take up the white plastic inner cover,the remove the battery to replace it Best Service : Not satisfied with your order? Please feel free to contact us. You can choose to exchange the item(s) you ordered or to receive a full refund. We provide one years of guarantee for this watch. Nice for collection,this is a best gift for mens for birthday,Christmas