Collection: Sekel Case Material: Stainless steel 316L Case Size: 41 mm Strap Material: Brown Italian vegetal tanned leather strap; Stainless steel buckle, quick release spring bars Strap Size: 20 mm Hands: Blue plated with Super-LumiNova Dial: Sunray brushed sterling silver plated with applied indexes, Super-LumiNova markers Crystal: Double domed sapphire crystal with AR coating Movement: Kronaby connected movement BT003, one sub dial, Bluetooth 5.0 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