Vidonn X5 is a smartband with 3D sensor, build-in Bluetooth 4.0, PC cloud service, it tracks your daily activity and sleep quality, make your life more funny. The Vidonn APP works with the device as well as Vidonn account to keep everything tracked on the go. You can download Vidonn from APP store and upgrade it. So buy this product and Save 20% Off for Vidonn X5 Bluetooth 4.0 IP67 Smart Wristband Sports & Sleep Tracking Health Fitness for iPhone 4S 5 5S 5C Samsung S4.