Collection: Sekel Case Material: Stainless steel 316L Case Size: 38 mm Strap Material: Black with blue lining Italian vegetal tanned leather strap, stainless steel buckle Strap Size: 18 mm Hands: Blue and silver plated with Super-LumiNova Dial: Sterling silver plated circular brush with applied indexes Crystal: Double domed sapphire crystal with AR coating Movement: Kronaby connected movement BT002, 2-hand-bi-directional micro stepping motor, Bluetooth 4.1 Low Energy (BLE), vibration motor, accelerometer Battery: Battery Life up to 2 years (depending on use), CR3032 coin cell APP: Kronaby App working with (or later version) Android 5.0 and iOS 9 Water Resistant: 10 bar/ 100 metres