Time/Date Display: Easily switch between 12/24-hour formats by long-pressing the button on the time display interface Step Tracking: Monitor your daily activity with an accurate step counter to help you stay active Alarm Function: Set customizable alarms to remind you of important tasks and appointments Vibration Reminder: With a vibration reminder function, you can set it as you need Sleep Monitoring: With sleep quality monitoring function, sleep quality level is clear at a glance Stopwatch & Countdown Timer: Includes both stopwatch and countdown timer functions for versatile timing needs Micro USB Charging: Comes with a Micro USB charging cable for convenient charging anywhere, anytime Specifications: Display: LED seven-segment display Charging method: Micro USB Battery life: charge and discharge times>300 times Power supply voltage: DC=4.5V~5.5V Operating atmospheric pressure: m860hPa~1060hPa Battery capacity: 50mAh Sleep current: 60uA Standby time: 20 days Strap material: TPU