Recommended Features: * Material: Nylon. * Size S, M, L, XL* S: width 2.5cm, length extendible 35-43cm*M: width 2.5cm, length extendible 40-48cm * L: width 2.5cm, length extendible 44-52cm *XL: width 2.5cm, length extendible 52-60cm * Three flashing modes available--light on, slow blinking and fast blinking. * Light colors: With 7 colors available, red, yellow, blue, green, orange, white and pink* With lithium CR2016 batteries (included), which can keep on flashing for 60-80 hours (blinking mode) and 30 hours (light on mode). The batteries are replaceable * ELITESHINE provides various types of LED flashing items, such as LED dog necklace, LED dog badge, LED waist belt, LED bracelet, LED lanyard, LED luggage badge, LED shoelace, LED pet collars. How to use: Fasten the collar with the buckle. Press the on/off button to turn on/off the light. Eliteshine LED collar helps others see both you and your dog while out on walks at night or in the dark! Three different light settings - light on, slow blinking and fast blinking. Lightweight for your dog"s maximum comfort. Nylon webbing over the light strip for maximum durability and protection from water. LED lights are very bright to provide visibility up to 1,000 Feet in the dark. This safety LED glowing dog collar is weatherproof, shock-resistant and lightweight, ideal for the active dog.