Sounce brings this strap scratch resistant fingerprint and waterproof' matte silicone wrist band, which Is easy to attach and detach. It is made of silicone and it's lightweight And durable which helps you to hold your device and protects it from damage. It can be adjusted to different lengths, It's Skin-Friendly and provides a comfortable feeling when you wear it. It does not rotate or pinch while sleeping. Installing the module is easy and the plastic holds it securely. It is fairly simple to put on one-handed and fits snugly so the heart rate monitor functions well and it looks nice and rich in matte black.