The minimum and maximum circumference range between 140 to 206 millimeters screen size:1.15' x 0.83' width:1.42' diagonal pebble:1.46” x 1.86” x 0.48”.The Ionic combines its fitness know-how with the smarts of a variety of companies it’s bought – such as Pebble, which Fitbit acquired in 2016 – and brought it all together to add an impressive new wearable to its range.Buy with confidence when your Fitbit product, ships from and is sold by authorized Fitbit retailer.Increased pixels & amplified brightness up to 1000 nits, operating temperature: 4 degree to 113 degree Fahrenheit, maximum operating altitude: 30,000 feet.Track runs, swims, rides, workouts, all day activity and sleep with 4 plus day battery life (varies with use & other factors).Durable screen corning gorilla glass 3 is tough and damage resistant

Access your favorite apps for sports, weather & more and make payments on the go with a built in nfc chip.

Package includes both large and small size bands for the perfect, comfortable fit for all day & all night wear.Use built-in GPS to track pace, distance & routes and get Pure pulse continuous heart rate tracking & real-time zones.If the band sizes are small, it fits a wrist of circumference 5.5 6.5 inches and if the band size is large, it fits wrist in the circumference of 6.7 8.1 inches Store and play 300 plus songs, and download playlists from Pandora.And later, android 4.4 and later and windows 10 devices. Syncs with mac os x 10.6 and up, iPhone 4s and later, iPad 3 gen. Certain features like smartphone notifications may require android 5.0 plus.

Start dynamic personalized workouts on your wrist with step by step coaching.

Take your performance to the next level with Fitbit Ionic™, a GPS smartwatch packed with fitness guidance, 24/7 heart rate, health and wellness insights, on-screen workouts, phone-free music, payments and more

Buy fitbit ionic