These Bright Green and Orange Flashing LED Collars, are the perfect collar for Autumn and Winter Walks. Your dog can be seen up to 1/4 of a mile away. The collar has 3 flashing speeds. Rapid Blink, Slower Blink. Constant Light. Made of high quality nylon, with a light transmitting core that illuminates when turned on. Fully weather -resistant, powered by an easily replaceable battery (included). Available in 2 colours and 3 sizes. Fitting instructions - To get the perfect fit, simply pull the black box and the attached clear cord out from the collar. With scissors, cut the desired and length of cord from the end. This will allow more adjust ability. For eg. The large Collar is 67cm at its largest. If you cut 7cm then the collar can adjust down to 54cm. Then simply and easily slide the cord back into the collar. It is now ready to use.