Fitbit AltaFitbit Alta HR
Tech specs 
SizeWidth 15mm
(Sizes depend on type of band)
Device Dimensions: 15 mm x 10 mm x 35 mm (W x D x L)
(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.
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
DisplayOLEDB&W OLED touchscreen
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
Activity tracking 
Calories burnedYesYes
Heart rate24/7
Stress & recovery
Pulse Ox
Respiration rate
UV exposure
Skin temperature
Galvanic skin response
Hydration level
Calorie intake
Running features
Swimming features
Other Clock, auto sleep detection, silent wake alarm, auto exercise recognition.Clock, auto sleep detection, silent wake alarm, auto exercise recognition.
Non-fitness functions 
Smartphone notificationsYesYes
On-board music storage
Connected pay
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