With the VO2 max estimator, this watch is made to maximize your physical performance. FnixAR can track your swimming, skiing and running progress, making it the ultimate tool to have year round. LED backlight for all day visibility. Scratch resistant wrist band. Enhance fitness routine with Recovery Advisor or VO2 Max. Navigation software also has altimeter, barometric and compass options. Customize watch display features and data fields through Connect IQTM store. Lithium ion 3000 mAh rechargeable battery. Battery life: up to 20 hours during GPS training, at most six weeks in watch mode. Due to federal shipping restrictions regarding products containing lithium batteries, this product cannot be shipped to Canada, Hawaii, Alaska, Catalina Island, Puerto Rico, APO, FPO, or international addresses. Thanks for your understanding.. Weight: 2.9 oz.. Imported.