Key Features: - 10 atm water resistant grade, support up to 100 meters (328feet) underwater operation. - Precise hour, minute, second, date and day display, support month, date and week day check. - This watch has chronograph, countdown, dual time zone, alarm clock and hourly chime functions. - Can set alarms for different time zones. - 12/24 hour format selectable. - Positive electro luminescent backlights built-in. - Support shock resistant. - With comfortable soft TPU band strap. Parameters: Time Accuracy: ±30 seconds per month Dive Maximum Operating Depth: 100m (10 ATM) Countdown Range: 23:59'59'' to 0:0'0'' Watch Shape: Round Movement: Digital Battery Code: CR2016 Operating Battery Life Time: 1.5 to 2 years Dial Window Material: High Transparency Resin Watch Case Material: ABS Plastic Dial Color: Blue Green Case Diameter: 43 mm Case Thickness: 13 mm Watchband Material: TPU Band Band Color: Blue Green Clasp: Pin Buckle Band Width: 18mm Maximum Wrist Circumference: 200mm Minimum Wrist Circumference: 140mm Product Weight: 34g Package Weight: 200g Note: The battery is replaceable. If you find that the watch is not working or the text on the display is not clear, please replace the watch battery in time.