NO BATTERIES NEEDED: This watch is Automatic self-winding mechanical movement, it is powered by the motion of the wearer's wrist. For first time wear the crown must be turned clockwise about 15-20 full turns. If the watch is not worn for 8 or more hours per day, it will work slower than usual or even stop briefly. STAINLESS STEEL CASE: hypoallergenic, corrosion- and scratch-resistant TRANSPARENT WATCH: Engraved, see-through intricate cutout dial and exhibition case-back allow you to watch on your wrist as the mechanism inside marks the passage of time. WATERPROOF: 30 meters of life waterproof, built-in waterproof accessories using high-precision sealed waterproof ring, effectively protect the hot gas and water molecules do not enter the watch. You can wash your face and shower normally. However, to protect the life of the watch, do not shower hot water or swim!IDEAL GIFT: A best gift for boyfriend,father,business partner,friend,brother,colleagues,familyOCCASIONS: The watch is suitable for every occasion (casual, business, party, outdoor, indoor activities or daily use).