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Fitbit Charge 2 General Info &
Specifications
Sensors
Your Charge 2 contains the following sensors:
•! A MEMS 3-axis accelerometer, which tracks your motion patterns
•! An altimeter, which tracks altitude changes
•! An optical heart rate tracker
Materials
The wristband that comes with Charge 2 is made of a flexible, durable elastomer
material similar to that used in many sports watches. It does not contain latex.
Accessory wristbands are available in genuine leather.
The buckle and frame on Charge 2 are made of surgical-grade stainless steel. While
all stainless steel contains traces of nickel and can cause an allergic reaction in
someone with nickel sensitivity, the amount of nickel in all Fitbit products meets the
European Union's stringent Nickel Directive.
Wireless technology
Charge 2 contains a Bluetooth 4.0 radio transceiver.
Haptic feedback
Charge 2 contains a vibration motor, for alarms, goals, notifications, and reminders.
Battery
Charge 2 contains a rechargeable lithium-polymer battery.
Memory
Charge 2 stores most minute-by-minute stats and exercise data for seven days. It
stores SmartTrack data for three days and summary totals for 30 days. Heart rate
data is stored at one-second intervals during exercise tracking and at five-second
intervals at all other times.
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