Fitbit Alta HR, Black, Large (US Version)

Features

• Get the power of continuous heart rate in Fitbit's slimmest design yet-all day, during workouts and beyond. Alta HR contains a Bluetooth 4.0 radio transceiver. The operating temperature is minus 10 to 45 degree Celsius
• 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. Maximum operating altitude: 30,000 feet
• Made of a flexible, durable elastomer material. The minimum and maximum circumference range between 170 - 206 millimeters.
• 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.