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Fitbit charge HR Black Large used has some wear please see picture 2 other than that works great
Come
Heart Rate:
Like all heart rate monitoring technologies, accuracy is affected by physiology, location of device, and different movements. Learn more about wear during workouts.
Battery life: lasts up to 5 days
Memory
Tracks 7 days of detailed motion data – minute by minute.
Tracks daily totals for past 30 days
Stores heart rate data at 1 second intervals during exercise tracking and at 5 second intervals all other times
Water Resistance
Fitbit Charge HR is sweat, rain and splash proof. However, the device is not swim proof or showerproof. With any wearable device, it’s best for your skin if the band stays dry and clean.
Care
If the band gets wet or if you sweat in it, remove and completely dry the band before putting it back on. Clean the band with a mild soap-free cleanser like Cetaphil or Aquanil. Give your wrist a rest by taking the band off every now and then. Learn more.
Materials
Fitbit Charge HR's wristband is made of a flexible, durable elastomer material similar to that used in many sports watches. Fitbit Charge HR also has a surgical-grade stainless steel buckle.
Environmental Requirements
Operating temperature: -4° to 113° F
Maximum operating altitude: 30,000 feet
Syncing
Fitbit Charge HR syncs automatically and wirelessly to computers and 200+ leading iOS, Android and Windows devices using Bluetooth 4.0 wireless technology.
Syncing range: 20 feet
Call notifications via Bluetooth 4.0
Syncing to computers requires Internet connection and USB port
Syncing to mobile devices requires Bluetooth and Internet connection
Syncs with Windows Vista and later, Mac OS X 10.6 and up, iPhone 4S and later, iPad 3 gen. and later, and leading Android and Windows devices
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