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Fitbit Flex 2 fitness tracker

The Fitbit Flex 2 is a band based fitness tracker with step counting, sleep tracking, calories burned and is the first swim-proof device from Fitbit.


The Fitbit Flex 2 is a band based fitness tracker with steps, sleep, and calories. The manufacturer claims a battery life of 5 days. The band is available in large and small sizes. It is a small module that can be inserted in a band, bangle, or pendant. It has a 3-axis accelerometer sensor. It has notifications for calls and texts. It has socialization features: Exercise Sharing. It includes inactivity alerts which remind you to move if you are sitting for a long time. Included accessories: comes with two wrist bands (large and small). Its dimensions are 0.5 x 0.4 inches (width/thickness) and it weighs 0.84 ounces.


Touchscreen Touchscreen An "at-wrist" display which is sensitive to finger contact.
Color display Color display A display that has color.
Backlight Backlight The display has a backlight for reading it in dimly lit conditions.
Battery removable Battery removable Shows whether the model has a removable battery.
Multi-sport tracking Multi-sport tracking Provides the most accurate results from the sports that are listed such as: running, walking, swimming, biking, cardio, and cross-training workouts.
Notification types Notification types Alerts you to incoming emails, text messages, calendar reminders, and phone calls.
Calls, texts
Socialization features Socialization features Sharing results of activities among a circle of friends. Some results include each friend's progress toward goals. Fitness milestones are celebrated with badges. Sends cheers and taunts while competing in group activities.
Exercise Sharing
WiFi WiFi A long-range wireless communication technology that enables a fitness tracker to pair with a smartphone and with other devices within a home network or remote location via the Internet.


Type Type Fitness trackers are available in several types, such has watch, band, and clip-on. A watch type fitness tracker has a data display similar to a smartwatch. A band is also worn on the wrist but has limited or no display capability. A clip-on is worn in various locations on your body via a clip to your clothing.
Sizes Sizes The strap is available in this range of sizes.
Small, large
Display type Display type LCD, OLED, or LED.
Display size (in.) Display size The diagonal size or diameter (if round) of the active display area measured to the nearest tenth of an inch.
Displays time Displays time Can display the time of day on the fitness tracker.
Sensor types Sensor types Sensors in the tracker detect real-world data which is translated into results like step count and heart rate measurements.
3-axis accelerometer
Battery life (days) Battery life As claimed by the manufacturer.
Real-time heart-rate monitor Real-time heart-rate monitor Continuously measures your heart rate.
Heart-rate monitor type Heart-rate monitor type Indicates what type of heart-rate monitor is used, if at all. The three types are stationary, active and passive. Stationary heart-rate monitors measure your pulse only at intervals you choose, mostly at rest. Active heart-rate monitors display your pulse continuously, or automatically at various intervals. Passive heart-rate monitors do not provide real-time heart rate monitoring.
Heart-rate monitor requires chest strap Heart-rate monitor requires chest strap Unlike those that have the heart-rate sensor built-in to the fitness tracker, a separate accessory worn on your chest is required.
Activity results read from device Activity results read from device Some results can be read directly from the fitness tracker without having to depend on the smartphone, tablet, or computer.
Step counting Step counting A basic feature of fitness trackers which automatically counts the amount of steps taken during daily activities.
Floors climbed Floors climbed Estimates the number of floors that you've climbed.
Food tracking Food tracking Can log food types into the app to keep track of daily calorie consumption.
GPS tracking GPS tracking Connects to GPS satellites to measure distance you moved during various exercises.
Sleep tracking Sleep tracking Provides information about the quality and duration of your sleep habits.
Sleep sensing method Sleep sensing method Auto mode senses when you are sleeping. Manual mode requires you to activate a setting on the device before you go to sleep.
Socialization Socialization Sharing results of activities among a circle of friends. Some results include each friend's progress toward goals. Fitness milestones are celebrated with badges. Sends cheers and taunts while competing in group activities.
Notifications Notifications The fitness tracker alerts you whenever your smart device receives a new text, phone call, or email, etc.
Inactivity alerts Inactivity alerts The fitness tracker alerts you when you've been inactive for a long period of time.
Alarm type Alarm type The device alerts you via sound or vibration.
Music controls Music controls Controls music being played on your smartphone or directly from the device.
App name App name The manufacturer's app that you can download and install on the smartphone, tablet, or computer. The app presents the full amount of data.
OS compatibility OS compatibility List of compatible operating systems such as iOS, Android and Microsoft.
iOS, Android, Windows
Bluetooth USB dongle Bluetooth USB dongle Includes a dongle which can be used in case your old computer lacks Bluetooth.
Included accessories Included accessories Indicates what additional accessories are included.
Two wrist bands, charging cable
Dimensions (WxD) Dimensions (WxD) Dimensions of the device in inches.
0.5 x 0.4
Weight (oz.) Weight The weight in ounces of the fitness tracker.
Warranty (yrs.) Warranty The manufacturer's stated length of warranty.