Key Features: -Precise display of hour, minute, second, date, day and month. -10 ATM water resistant grade support up to 100 meters (328feet) underwater operation. -Digital and analog movements. -Support dual time zone display. -12/24 hour format selectable. -Positive electro luminescent backlight built-in. -Support hourly chime function. -Support stopwatch function. -Support countdown timer function. -Support time alarm setup. -Support shock resistant. -Support full auto calendar. -With comfortable soft PU band strap. Parameters: -Time Accuracy: ±30 seconds per month -Dive Maximum Operating Depth: 100m (10ATM) -Countdown Range: 23:59'59'' to 0:0'0'' -Watch Shape: Round -Movement: Digital and Analog -Battery Code: CR2025 -Operating Battery Life Time: 1.5 to 2 years -Dial Window Material: High Transparency Resin -Watch Case Material: ABS -Dial Color: Black -Case Diameter: 45 mm -Case Thickness: 17 mm -Watchband Material: PU -Band Color: Black -Clasp: Pin Buckle -Band Width: 20mm -Maximum Wrist Circumference: 210mm -Minimum Wrist Circumference: 155mmNote: 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.