GRV S1 Fitness Tracker Replacement Band - Durable Silicone Wrist Strap for GRV Activity Tracker (No Bluetooth) - Perfect for Running, Gym Workouts & Daily Activity Tracking

I bought this as a replacement band for my JYouPro activity tracker bc they don't sell replacement bands for their devices; just the tracker & band color you order as one.A few reviews suggested this for that particular brand and it's great! The device fits perfectly in the opening. I think I ordered the youth size.There is no 'stopper' nobby thing on the band, though, like the original has. It's not a deal breaker.UPDATE:after actually wearing it, i noticed that the device popped out of the silicone.. if I didn't see it, I may have lost the device . I was hoping to order more colors, but this is a concern.