Assess your heart for atrial fibrillation -a heart rhythm irregularity- and easily share results with your doctor The Fitbit ECG app is only available in select countries. Not intended for use by people under 22 years old. Operating temperature: 14° to 113°F.An on-wrist skin temperature sensor tracks yours each night so you can see how it varies. You can also see your nightly blood oxygen levels at a glance with our collection of clock faces. Radio transceiver: Bluetooth 5.0. Operating temperature: -10° to 45° C. High & low heart rate notifications alert you if yours seems above or below your average. Battery lasts 6 plus days plus, fast charging gives you a full day's charge in just 12 minutes (Varies with use and other factors; up to 12 hours with continuous GPS). Comes just as you see in the Photos (New & Factory Sealed). Please Feel Free to ask any questions. This item is in the category "Sporting Goods\Fitness, Running & Yoga\Fitness Technology\Activity Trackers". The seller is "g11825m" and is located in this country: US. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech Republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South Africa, Thailand, Belgium, France, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi Arabia, United Arab Emirates, Qatar, Kuwait, Bahrain, Republic of Croatia, Malaysia, Brazil, Chile, Colombia, Costa Rica, Panama, Trinidad and Tobago, Guatemala, Honduras, Jamaica, Antigua and Barbuda, Aruba, Belize, Dominica, Grenada, Saint Kitts-Nevis, Saint Lucia, Montserrat, Turks and Caicos Islands, Barbados, Bangladesh, Bermuda, Brunei Darussalam, Bolivia, Ecuador, Egypt, French Guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman Islands, Liechtenstein, Sri Lanka, Luxembourg, Monaco, Macau, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Vietnam.