This product has 2 sizes,please choose the right size according to your needs5M: 18x10.8x3.8cm,the traction rope can be extended to 5m,suitable for dogs within 20kg8M: 20x12x4.2cm,the traction rope can be extended to 8m,suitable for dogs under 50kgRetractable Belt: Suitable for small and medium-sized dogs,up to 5/8m in length,providing comfort and maximum freedom for your pet in a safe environment.For Nighttime Environments:Detachable flashlight (The original packaging does not include the battery) gives you maximum visibility and safety while walking at night.One Button Brake Lock: One-touch braking and locking safety system,which allows the dog leash to be adjusted to a comfortable length with ease,walk your dog freely in open area with one hand braking,ensure that you have complete control over your dog's safety.Environmentally Friendly Material: Super comfortable grip for long walks,solid ABS plastic case is non-toxic and odorless.8M/5M nylon Ribbon,strong and durable.Ergonomic Anti-slip HandleComfortable design,ergonomic and anti-slip soft handle to help you comfortably maintain a strong grip on dogs that are pulling and running.