Walk your dog with the Led Leash, knowing very well they're safe from vehicles at night. The bright fiber-optic light is a great warning to get a driver's attention to slow down.
Just select the preferred mode you desire (different flashing speeds or static) using the switch control.
S = Width 1.5 CM - Length 120 CM - Emission length 30 CM
M = Width 2.0 CM - 120 CM length - Emission length 30 CM
L = Width 2.5 CM - 120 CM length - Emission length 30 CM
Battery: 2 x CR2016
The battery can be replaced at most convenience stores or supermarkets.