Buzz comes in two sizes: small and large. The overall size of Buzz doesn’t change between sizes. Only the strap size changes. It's the same Buzz with a better fit depending on your wrist size.
To determine your size, measure your wrist.
Small: 5.5” to 6.6” (14 cm to 16.9 cm)
Large: 6.7” to 9.3” (17 cm to 23.6 cm)
Don’t have a flexible measuring tape handy to measure your wrist? Simply take a strip of paper or piece of string, wrap it around your wrist, and mark where it overlaps. Then measure it on a ruler.