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.
Touch screenAn "at-wrist" display which is sensitive to finger contact.
Color displayA display that has color.
BacklightThe display has a backlight for reading it in dimly lit conditions.
Battery removableShows whether the model has a removable battery.
Multi-sport trackingProvides the most accurate results from the sports that are listed such as: running, walking, swimming, biking, cardio, and cross-training workouts.
Notification typesAlerts you to incoming emails, text messages, calendar reminders, and phone calls.
Socialization featuresSharing 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.
WiFiA 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.
TypeFitness 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.
SizesThe strap is available in this range of sizes.
ColorThe fitness tracker is available in this range of colors.
Display typeLCD, OLED, or LED.
Display sizeThe diagonal size or diameter (if round) of the active display area measured to the nearest tenth of an inch.
Displays timeCan display the time of day on the fitness tracker.
Sensor typesSensors in the tracker detect real-world data which is translated into results like step count and heart rate measurements.
Battery lifeAs claimed by the manufacturer.
Real-time heart-rate monitor
Real-time heart-rate monitorContinuously measures your heart rate.
Heart-rate monitor type
Heart-rate monitor typeIndicates 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 strapUnlike 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 deviceSome results can be read directly from the fitness tracker without having to depend on the smartphone, tablet, or computer.
Step countingA basic feature of fitness trackers which automatically counts the amount of steps taken during daily activities.
Floors climbedEstimates the number of floors that you've climbed.
Food trackingCan log food types into the app to keep track of daily calorie consumption.
GPS trackingConnects to GPS satellites to measure distance you moved during various exercises.
Sleep trackingProvides information about the quality and duration of your sleep habits.
Sleep sensing method
Sleep sensing methodAuto mode senses when you are sleeping. Manual mode requires you to activate a setting on the device before you go to sleep.
SocializationSharing 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.
NotificationsThe fitness tracker alerts you whenever your smart device receives a new text, phone call, or email, etc.
Inactivity alertsThe fitness tracker alerts you when you've been inactive for a long period of time.
Alarm typeThe device alerts you via sound or vibration.
Music controlsControls music being played on your smartphone or directly from the device.
App nameThe manufacturer's app that you can download and install on the smartphone, tablet, or computer. The app presents the full amount of data.
OS compatibilityList of compatible operating systems such as iOS, Android and Microsoft.
iOS, Android, Windows
Bluetooth USB dongle
Bluetooth USB dongleIncludes a dongle which can be used in case your old computer lacks Bluetooth.
Included accessoriesIndicates what additional accessories are included.
Two wrist bands, charging cable
Dimensions (WxD)Dimensions of the device in inches.
0.5 x 0.4
WeightThe weight in ounces of the fitness tracker.
WarrantyThe manufacturer's stated length of warranty.