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Charge HR General Info & Specifications
Sensors and motors
Your Charge HR uses a MEMS 3-axis accelerometer to measure your motion patterns
and determine your steps taken, distance traveled, calories burned, and sleep quality.
Charge HR also contains:
• An altimeter, which measures floors climbed
• A vibration motor, which allows it to vibrate when alarms go off, when you
reach a goal, and when you receive call notifications
• An optical heart rate monitor, which measures your beats per minute (BPM) at
rest and when you are exercising
Battery
Charge HR contains a rechargeable lithium-polymer battery. For information about
battery life, see “At any time you can check your dashboard to see the amount of
time you’ve spent in your custom zone.
For more details about heart rate monitoring, including links to relevant American
Heart Association information, see our “Heart rate FAQs” article on
https://help.fitbit.com.
Battery life and charging ” on page 7.
Memory
Charge HR holds detailed minute-by-minute information for the most recent 7 days,
and 30 days of daily summaries. Heart rate data is stored at one-second intervals
when in exercise mode and at five-second intervals at all other times.
Your recorded data consists of steps taken, distance traveled, calories burned, floors
climbed, active minutes, heart rate, and sleep tracked.
Sync your Charge HR regularly to have the most detailed data available to view on
your Fitbit.com dashboard.
