Looks like a watch, acts like a smartwatch. Smartphone notifications, activity tracking, custom goal setting, sleep monitoring, customizable buttons & automatic time zone updates Microcontroller movement, charging not required, (estimated 12 months) battery life based on usage. Water resistant up to 50m: Wearable while swimming in shallow water. Hybrid Movement Case Diameter: 45mm Water resistant to 50m (165ft: in general, suitable for short periods of recreational swimming, but not diving or snorkeling