Compatibility: Garmin Vivofit Jr 3 only. Device not included. Adjustable sizes: fits children with a wrist circumference of 130 mm to 180 mm. The child can adjust the Garmin Vivofit Jr 3 strap by adjusting the buckle. Easy installation: no tools required; simply insert the Garmin Vivofit Jr 3 into the holes of the silicone and gently pull to fit. No sharp objects; suitable for children. High-quality material: this strap for Garmin watch is made of waterproof silicone material, comfortable and lightweight, with a variety of colours; suitable for children's daily use at school, outside sports and other occasions. Benefits and uses: - Reliable compatibility and easy setup remove any frustration for parents and kids. - Adjustable size covers a broad range of small wrists for growing kids. - Durable, waterproof silicone construction for daily wear in class, play, and sports. Use scenarios: - School day activity and reminders during classes. - Outdoor sports or playground play, running, cycling, or gym activities. - Family outings or travel where durable, comfortable wear is important.