- Brand: LouisWill - Case Diameter: 41mm Case Thickness: 11mm "Strap Width: 19mm - Case Material: Steel Mirror Material: Mineral Reinforced Mirror " Watch Movement: Quartz - Water Resistance: 3ATM Clasp Type: Butterfly Clasp Comfortable and Fashion: Luminous pointer effect, folding clasp buckle and hypoallergenic steel strap, comfortable and durable for everyone wear. - 30M Waterproof: The sports watch with outstanding performance, 30M water resistant is fine for hand washing, rainy day and sport sweating.