Compatibility：
Fitbit Charge 3 / Charge 3 se / Charge 4. The Fitbit device is not included.
Feature:
1. Made of quality silicone material, environmental and healthy.
2. Comfortable to wear. No problem for doing in most sports.
3. Skin-friendly and provides comfortable feeling when you wear it during sleep.
4. The size can be adjusted according to the circumstance of individual.
Packing Include:
1 x watch strap (band only,smart watch is not included).