Fitbit Alta HR
Tech specs 
SizeWidth 15mm
(Sizes depend on type of band)
MaterialWristband is made of a flexible, durable elastomer. The tracker is made with surgical-grade stainless steel, and the buckle is made with aluminum.
ChargingUSB
BatteryLithium-polymer
Battery lifeup to 7 days
Water-resistanceSweat, rain and splash proof
Weight15 grams
Sensor3-axis accelerometer, Vibration motor, optical heart rate sensor
DisplayOLED
Screen size1.4-inch, 128 x 36 pixel resolution
ColorsBlack, Blue/Gray, Coral, Fuchsia
Other
Activity tracking 
StepsYes
DistanceYes
CaloriesYes
ActivityYes
Floors
SleepYes
Heart rate24/7
Vo2Max
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
GPS
Running features
Swimming features
Smartphone notificationsYes
Other Clock, auto sleep detection, silent wake alarm, auto exercise recognition.
Links 
Affiliate link*Amazon | Fitbit
Read moreReview
*Disclosure: We are a professional review site that receives a small commission from sales of certain items, but the price is the same for you. See our affiliate disclosure page for more details.
**All tech specs and images on this page come from manufacturers. These may change over time as manufacturers sometimes update their devices. While we cannot guarantee absolute accuracy of information on this page, we promise to review this content regularly and do our best to bring you the most up-to-date information. To be absolutely sure of tech specs of a particular device, we recommend checking the manufacturer’s website.