General Info and Specifications
Sensors
Fitbit Flex 2 contains the following sensors and motors:
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A MEMS 3-axis accelerometer, which tracks motion patterns
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A vibration motor
Materials
The wristband that comes with Flex 2 is made of a flexible, durable elastomer
material similar to that used in many sports watches. It does not contain latex.
The clasp that comes with Flex 2 is 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.
Fitbit accessory bangles, bands and, pendants sold separately are available in
durable elastomer and stainless steel.
Wireless technology
Flex 2 contains a Bluetooth 4.0 radio transceiver.
Battery
Flex 2 contains a rechargeable lithium-polymer battery.
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