Compatibility: This Twist-O-Flex™ band is compatible with your Fitbit Charge 2.Materials: The stainless steel construction of this band boasts impressive strength and water resistance. It’s the perfect companion to make your Fitbit work for you outside the gym.Easy on, easy off: There’s no need to struggle with a clasp or buckle when you choose the Twist-O-Flex™ band. It features a large expansion range of up to 5” inches, allowing you to easily put on and take off as needed.