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General Info and Specifications
Sensors
Fitbit Charge 4 contains the following sensors and motors:
lA MEMS 3-axis accelerometer, which tracks motion patterns
lAn altimeter, which tracks altitude changes
lA GPSreceiver, which tracks your location during a workout
lAn optical heart-rate tracker
lA vibration motor
Materials
The housing on Charge 4 is plastic. The Charge 4 classic band is made of a flexible,
durable elastomer material similar to that used in many sport watches and includes
a surgical-grade stainless steel buckle.
Wireless technology
Charge 4 contains a Bluetooth 4.0 radio transceiver and NFCchip.
Haptic feedback
Charge 4 contains a vibration motor for alarms, goals, notifications, reminders, and
apps.
Battery
Charge 4 contains a rechargeable lithium-polymer battery.
50
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