See yourself as a runner This easy-to-use GPS smartwatch is designed for people of all skill levels to track their stats and chase their fitness goals. Track your time, distance pace and speed during your run or walk with built-in GPS. Monitor your overall health and wellness with wrist-based heart rate1 and more. Take guesswork out of training. This smartwatch suggests runs tailored to you. High-end running features help you meet your potential. Minus the high-end price tag. Track more than just running with an array of built-in activity profiles. Get up to 2 weeks of battery life. Because less charging is always a good thing. Materials: Lens Material: Chemically strengthened glass Quick Release Bands: Yes (20 mm, Industry standard) Strap Material: Silicone Physical Size: 42 x 42 x 11.6 mm Fits wrists with a circumference of 126-203 mm Colour Display: Display Size: 1.04″ (26.3 mm) diameter Display Resolution: 208 x 208 pixels Display Type: Sunlight-visible, transflective memory-in-pixel (MIP) Weight: 37 g Battery: Smartwatch mode: Up to 2 weeks GPS mode: Up to 20 hours Water Rating: 5 ATM Memory/History: 200 hours of activity data In the Box: Forerunner 55 Charging/data cable Documentation