The Fitbit Versa 4 Fitness Smartwatch in Black Graphite features a sleek black silicone band and a 40mm black case. It is compatible with both iOS and Android operating systems and comes with Fitbit OS as its operating system. With Bluetooth connectivity and a clock feature, this smartwatch is perfect for tracking your fitness goals and staying connected on the go. Additionally, it is unlocked and comes with a 1-year manufacturer warranty for added peace of mind.