In addition to sleep, the One tracks your daily activity, including steps taken, stairs climbed and calories burned. The Fitbit One is conveniently small and easily clips onto your pocket, belt or even bra. The UP3 does not include this functionality. One difference between the UP3 and UP4 is that the UP4 includes Amex Payments – you can connect your UP4 band to an American Express Card and make payments from your wrist. Advanced sleep tracking empowers you to understand your sleep quality even further by tracking your Wake, REM, Light and Deep sleep. Using bioimpedance sensors to track your heart rate, the UP3 and UP4 can detect your sleep phases with a high degree of accuracy. On top of the basic features – activity tracking, sleep tracking and stopwatch mode, the UP3 and UP4 boast advanced sleep tracking, heart health monitoring, automatic sleep detection and smart alarm.
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