Get an uninterrupted picture of your daily health and nightly sleep with up to 14 days of battery life in smartwatch mode and up to 30 hours in GPS mode. With its sleek design and 1.7 oz weight, you’ll almost forget you’re wearing Forerunner 255 Music — even when you’re asleep. Featuring easy-to-use buttons and a silicone band, this watch is ready to wear — and tear — with durable Corning® Gorilla® Glass 3.