Build-in Maxell CR2450 Button Cell, the watch works for 12 months under normal using and over 33 months under energy saving mode without charging; stores movement data of the latest 21 days, old data will be covered cyclically; supports 10 kinds of language. NOTE: The battery CR2450 is easy to buy and replaced.
Shock resistant, waterproof, Bluetooth connection smartphone. LED back light functions make it perfect for all kinds of sport and daily use
Water Resistant, LED Display, EL Back Light, Bluetooth Reminder, Pedometor, Sport Management (Goal setting, complete percentage, sport record and analysis), Remote photography (slight click to let phone take picture automatically), Bluetooth Sync (Synchronize netwok time through bluetooth), Smart Alarm (Synchronize the alarm in phone), Stopwatch, Time (Hour/Minute/Second/Year/Month/Date/AM/PM), Low battery reminder, EL backlight, 50M waterproof
164 ft waterproof (50 M) - 5ATM. In general, suitable for swimming and snorkeling, but not for diving.
NOTE: please DO NOT press any buttons in the water