Upgrade your fitness tracking with the TUDIA 2-in-1 Bicep & Wristband, a rugged protection and strap combo engineered exclusively for the Amazfit Helio Core module. This heavy-duty, metal housing shields your tracker from gym floor impacts and scratches far better than standard plastic, while the continuous-loop elastic band stretches seamlessly from 4.7" to 14" for a secure, bounce-free fit on either your wrist or upper arm. Designed with premium stretch material to slide easily over your hand for instant comfort, allowing you to swap your Helio tracker into the snap-on frame in seconds and transition flawlessly into high-intensity training. Please Note: 1. Includes protective case and band combo only; device is not included. 2. Pull the outer strap to extend the band. 3. Pull the buckle/inner band to shorten the band.