Letsfit Fitness Activity Tracker watch connect to your smartphone via Bluetooth. It has excellent battery life that lasts up to 10 days. The watch includes 14 sport modes to keep you fit and is perfect for fitness enthusiasts. It has IP68 technology which makes this watch dust-proof, water-proof, and sweat-resistant. You can access your smartphone's calls, texts, and notifications through this watch and listen to endless music. The watch accurately measures heart rate, sleep, active hours, calories burned, etc.  The band is made up of Thermoplastic Polyurethane and the screen size is 21.84 inches.