Steady glow and flash mode
80 hour replaceable battery life (normally 2-3 months)
100,000 hour LED life
Visible up to 1000 feet in the dark.
Batteries included and replaceable (2PCS CR2016).
S = Width 2.5CM * Length (34 ~ 42) CM
M = Width 2.5CM * Length (37 ~ 49) CM
L = Width 2.5CM * Length (40 ~ 54) CM
XL = Width 2.5CM * Length (42 ~ 59) CM
Please Note: Size XS is different from other sizes