Fitbit Alta HR, Black, Large (US Version)
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The minimum and maximum circumference range between 170-206 mm. Alta hr contains a bluetooth 4.0 radio transceiver. Operating temperature is minus 10 to 45 degree celsiusGet the power of continuous heart rate in Fitbit's slimmest design yet-all day, during workouts and beyond. Issues like not syncing despite successful setup, not responding to taps despite being charged and not tracking your steps or other data can be corrected by restarting your tracker reboots the device but does not delete any data
With heart rate, you can better measure calorie burn, and use zones (Fat Burn, Cardio, and Peak) to find the right workout intensity for your goals
With sleep stages powered by PurePulse heart rate, automatically track your time spent in light, deep and REM sleep and take steps toward a better night's rest
See how working out more can improve your health by comparing your resting heart rate trends to your activity, Sync stats wirelessly & automatically to computers and 200+ leading iOS, Android and Windows devices
Automatically track your steps, distance, calories burned and active minutes with up to 7 days of battery life
Tap to see your stats, time & notifications on an OLED display, plus customize your clock face
Operating temperature: 14 degree to 113 degree fahrenheit Maximum operating altitude: 30,000 feet
Made of a flexible, durable elastomer material
Buy with confidence when your Fitbit product 'ships from and is sold by' the following authorized Fitbit retailers: Amazon.com, Heart Rate Monitors USA and Clever Training. Fitbit does not guarantee the quality or authenticity of products purchased from non-authorized resellers on Amazon, and they are not eligible for warranty and replacement from Fitbit