This product has 2 sizes, please choose the right size according to your needs! 5M: 18x10.8x3.8cm, the traction rope can be extended to 5m, suitable for dogs within 20kg 8M: 20x12x4.2cm, the traction rope can be extended to 8m, suitable for dogs under 50kg Retractable 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.