Fitbit Ionic Health & Fitness Smartwatch (GPS) with Heart Rate, Swim Tracking & Music-Blue Silver-Grey, One Size Start dynamic personal coaching on your wrist with step-by-step instruction. Syncs with windows vista and later, mac OS X 10.6 and up, iphone 4s and later, ipad 3 gen and later. Syncing range up to 20 feet Store and play 300+ songs, no phone needed. Water Resistance - Fitbit Ionic is water-resistant up to 50 metres and is sweat, rain and splash-proof. With any wearable device, it’s best for your skin if the band stays dry and clean Use built-in GPS/GLONASS to track pace, distance & routes. Corning Gorilla Glass 3 is tough and damage resistant. Increased pixels and amplified brightness up to 1000 nits Get PurePulse continuous heart rate tracking & real-time zones,Multi-day battery life of 4+ days (varies with use & other factors) Fitbit products are compatible with most devices using the following operating systems Apple iOS 9 and later, Android OS 5.0 and later, or Windows 10 v1607 or later Load credit and debit cards to your Wallet in the Fitbit app. Available with participating banks.