RumbaTime is a silicone digital timepiece that is as bold in color as it is in style. They are waterproof easy to wear and look great alone or grouped together. The RumbaTime watch is the perfect accessory to add a streak of color while surfing skating doing yoga or galavanting around town. Each RumbaTime watch comes in its own sleek fun test tube package and is the ultimate accessory for life on the go. It has a digital face silicone rubber strap water resistant to 99 feet and weighs 10 grams. Size Small will fit most women and children (6inches/160mm). Medium will fit most men and some women (7inches/180mm). Large will fit Some men (8inches/200mm). Battery life will last 12-18 months and is replaceable. Battery type is SR626.