Energizer Silver Oxide 377 Batteries (2 Battery Count) – Packaging May Vary

✅ 【Heart Rate & Sleep Monitoring】：Measuring your heart rate on every 1 / 2 / 6 / 12 hour automatically, and you can also set up real-time heart rate tracking or manually tracking once you set it up in the app. Also support automatic sleep monitoring from 6:00pm to second day you get up, it records deep sleep, light sleep, stay up and awake states. Clearly acknowledge your physical fitness status at whole day / week / month. ✅ 【30 Days Normal Use Time】：Charge 2 hours, normal use 30 days, standby 60 days. A time full charge gives you 30 days normal use, 60 days working. I think it will greatly save your charging time and improve the efficiency of use. ✅ 【Fitness Tracker with 6 Sport Modes】：Switch 6 different sport modes on watch directly. Built-in advanced 3D sensor and pedometer to accurately count your steps, calories burned & distance achieved. Steps: 1. Long press to choose which kind of sport, 2. long press again to enter sport mode, it will count 3, 2 ,1. Then you can start your excerise.