Material: nylon, fiber
optic Width: about 2.5 cm
Length: S (35-43 cm) M (40-48 cm) L (45-52 cm) XL (52-60 cm)
Package includes:1 wash collar and 1 USB cable
1. flashing mode: long light, flash, slow flash, close (through switch control).
2. New style, rechargeable by USB, without battery.
3. Best safety for your pet in a dark environment or walking at night and outdoor