Key Features: -Up to 10 ATM waterproof level, which can work normally at a depth of 100 meters (330ft) underwater. It is not only suitable for wearing in water activities such as swimming, diving, snorkeling, surfing, rowing, water skiing, but also suitable for wearing in daily life and outdoor sports, such as jogging, hiking, climbing, cycling, etc. -Featuring pedometer and fitness tracker functions which could record distance, walking time, calories consumed. -Built-in lap stopwatch function. -12/24 hour format selectable. -Alarm clock, calendar, back light functions were integrated. -Japanese quartz movement. -Shock resistant. -With comfortable and soft TPU watch strap. Parameters: Time Accuracy: ±30 seconds per month Dive Maximum Operating Depth: 100m (330ft) Watch Shape: Round Display Type: Digital Movement: Japanese Quartz Battery Code: CR2025 Operating Battery Life Time: 1.5 to 2 years Dial Window Material: PMAA High Transparency Resin Watch Case Material: ABS Dial Color: Gray Case Diameter: 43mm / 1.7inch Case Thickness: 12mm / 0.5inch Watch Strap Material: TPU Watch Strap Color: Black Clasp Type: Pin Buckle Watch Strap Width: 22mm / 0.9inch Maximum Wrist Circumference: 225mm / 8.9inch Minimum Wrist Circumference: 135mm / 5.3inch Product Weight: 46g / 0.1lb Package Weight: 200g / 0.44lb Note: watch 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.