The LED horse collar helps for better be seen in the dark. It has an intefrated USB adapter for easy charging, the charger is included. The outer shell is weatherproof and therefore perfect for a ride during bad weather. You can change the light between steady mode (lasting 2,5 hours), rapid flashing or slow flashing (lasting 4 hours) with just 1 click. The size is adjustable and can be reduced by simply cutting of the part not needed.