Fitbit AltaFitbit Alta HR
Tech specs 
SizeWidth 15mm
(Sizes depend on type of band)
Width 15mm
(Sizes depend on type of band)
MaterialStainless steel clasp, Classic band (elastomer), Metal band (stainless steel metal), Leather band (soft, genuine leather)Wristband is made of a flexible, durable elastomer. The tracker is made with surgical-grade stainless steel, and the buckle is made with aluminum.
ChargingUSBUSB
BatteryLithium-polymerLithium-polymer
Battery lifeup to 5 daysup to 7 days
Water-resistanceSweat, rain and splash proof.Sweat, rain and splash proof
Weight29 grams15 grams
Sensor3-axis accelerometer, Vibration motor3-axis accelerometer, Vibration motor, optical heart rate sensor
DisplayOLEDOLED
Screen size1.4-inch, 128 x 36 pixel resolution1.4-inch, 128 x 36 pixel resolution
ColorsClassic (Black, Blue, Plum, Peal); Leather (Bluish Pink, Graphite); Metal (Stainless Steel)Black, Blue/Gray, Coral, Fuchsia
Other
Activity tracking 
StepsYesYes
DistanceYesYes
CaloriesYesYes
ActivityYesYes
Floors
SleepYesYes
Heart rate24/7
Vo2Max
Stress & recovery
UV exposure
Skin temperature
Galvanic skin response
GPS
Running features
Swimming features
Smartphone notificationsYesYes
Other Clock, auto sleep detection, silent wake alarm, auto exercise recognition.Clock, auto sleep detection, silent wake alarm, auto exercise recognition.
Links 
View onAmazon | Best Buy | Target | eBayAmazon | Best Buy | eBay
Amazon US rating4.2 out of 5 stars4.1 out of 5 stars
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