Description: Feature: 1.Walking the dog at night is safer, not hot, and comfortable to wear. 2.Three lighting modes: always on, fast flashing, slow flashing. 3.Comfortable polyester material, comfortable to wear. 4.D-ring traction buckle, you can go out with one buckle. Specifications: Product Name: double sided transparent LED flashing cat and dog universal chest strap Item Size: XS = Width 1.5CM * Chest Length ( 30 - 35 ) CM S = Width 2.0CM * Chest Length ( 32 - 37 ) CM M = Width 2.5CM * Chest Length ( 38 - 46 ) CM L = Width 2.5CM * Chest Length ( 46 - 55 ) CM XL= Width 2.5CM * Chest Length ( 62 - 58 ) CM You can adjust the length 1-5CM0.39-1.97 Luminous color: red, yellow, blue, green, orange, pink, white, colorful Light emitting principle of optical fiber style: LED light emitting - guiding light through optical fiber, Package: OPP bag Suitable for: large, medium and small pets Lighting mode: long light, fast flash, slow flash Package Included: LED Dog Harness*1 Notes: Note: Please make sure to measure your dog for accurate sizing before purchasing to ensure the perfect fit. The actual color of the item may slightly vary from the pictures due to the light and different monitors. The size is manual measurement, there may be 2-3cm error. Please understand.