Feature: 1. It can measure diving depth, diving time, and safety stop time, integrates outdoor sports functions such as altitude, air pressure, compass and other functions, 100m/328.1ft deep waterproof. 2. Diving data analysis, diving alarm, ascent speed, safety stop, mandatory safety stop, deep stop, water cover time and no‑fly time. 3. Multifunction, enterprise digital compass, altimeter, barometer, activity record, pedometer, calorie, distance record. 4. USB charging, charging for three hours and standby for two months, with the function of time, alarm, countdown, stopwatch and temperature display. 5. Suitable for swimming, cold shower, splashing, rain or snow, snorkeling, not suitable for high‑speed water sports, diving into the water, shower with hot water. Specification: Item Type: Watch for Diving Material: Stainless Steel Frame+ABS Cover+PU Band Band Size: L(Suitable for 180-210mm/7.1-8.3in wrist circumference) Dial Diameter: Approx. 45mm/1.8in Dial Thickness: Approx. 13mm/0.5inLong Side Band Length: Approx. 135mm/5.3inShort Side Band Length: Approx. 95mm/3.7in Band Width: Approx. 22mm/0.9in Total Length: Approx. 275mm/10.8inWeight: Approx. 212.0g/7.5ozModel: FR730 Quantity: 1Pcs Battery Type: Built-in Li-ion Battery Battery Capacity: 320MAH Operation Mode: Push Button Strap Style: Classic Buckle Function: Waterproof Communication Type: no CardFeatures: 1. Diving function, diving depth, diving time, water temperature, stall alarm, safety stop time, water depth, floating time. 2. Height: Can measure mountaineering altitude, relative altitude, 48-hour altitude change curve 3. Air pressure: 24-hour air pressure change curve/sea level pressure/current pressure 4. Compass: 16 directions 5. for Android APP Bluetooth diving data management 6. Time/Alarm Clock/Countdown/Stopwatch/Temperature/EL Backlight 7. Waterproof to 100 meters 8. USB charging. Package List: 1 x Watch for Diving1 x Wipe Cloth1 x USB Data Line Note: Manual measurement, please allow error 1‑2mm/0.04‑0.08in.