BIG PRICE DROP! I hate to see this one just sit. It is still in great shape! The battery lasts around 3 days if you run the pulse ox constantly in the background. As an asthmatic this was a game changer for me! It will last up to a week if you only use the o2 sensor on demand. This watch is fully water proof you can swim with it without causing any damage but the screen gets weird while in the water. Perfectly fine as soon as you shake the water off though. The gps is spot on and it has crash detection safety to alert your chosen number if there’s a fall or an accident. Some of the bands are stretchy, some aren’t. All the cloth ones can be tossed in the washing machine as needed. It would be hard to get this many bands for this price let alone with the watch!