1.USB RECHARGEABLE: This light up dog collar is USB rechargeable, which is more economical and environmentally friendly. Large battery capacity, charging about 2 hours, can be used continuously in constant light mode for 6-10 hours. Comfortable LED design, long time use will not heat up. 2.HIGH QUALITY MATERIAL: This LED dog collar is made of nylon and PU leather material. The unique dog paw print design, which allows you to keep 500 meters visibility in dim or no light conditions, so your dog stay safe and be seen and avoid traffic accidents. 3.7 MODES: Six constant light modes with adjustable colors (red, blue, green, pink, light blue, yellow), the last mode is the automatic cycle mode. 4.MILDLY WATERPROOF: Don't worry about walking your dog in light rain everyday, but please don't let the collar soak in the rain or wash the collar for a long time, just wipe it gently to make sure it works properly. 5.S SIZE(11.8- 15.7IN)The Dog Collar can be easily adjusted for size with the elastic buckle. (Note: S: 30cm - 40cm / 11.8- 15.7IN, please choose the size according to the length of your pet's neck.)