ONE SIZE FITS ALL: The length of the light up dog collar is 50cm. Generous length to fit many sizes of dogs and breeds and can be cut to any length to fit your pet. 3 LIGHT MODES: Easy adjustment by pressing the button you can change light modes. You can choose the flash modes (steady glow-quick flash-slow flash-off) according to different needs DURABLE TOUGH: The silicone tube of the collar is durable and tough. The tube part of the collar is waterproof but the battery and charging part is not waterproof, please keep it closed, and please don’t submerge the collar in water. FULLY USB RECHARGEABLE: The battery is USB rechargeable. Charge it for 40 minutes max. Excessive charging reduces performance. HIGH VISIBLE SAFETY COLLAR: Very bright in the dark to keep your pets visible and safe. Length: 50cm Width: 1.0cm It is suitable for use with a dog’s neck in the range of 50CM. Switch mode: fast flashing, slow flashing, long on, off USB: The charging method can be used repeatedly. Gram