[①How to lock/unlock:If you want to lock it at a certain distance you simply push the button down and pull back just a bit and the leash will lock. If you want to just stop the dog for a second you simply push the button to stop the retractable feature.If you want to unlock it push the big button forward. ②Suitable Choice : Small Leash is Suitable for Dogs Under 33 lbs; Medium for Dogs Under 44 lbsRetractable Leashes Not Suitable For Chewing. ③Durable and Sturdy : Features a premium rotary table and a durable 304 stainless steel coil to achieve durability and robustness. ④No Jams: We made our dog retractable leash with a 360° tangle-free swivel hook(clip)Coupled with a U-shaped. ⑤Ultimate Comfort: Let your dog free with our 10/16ft retractable dog leash an ergonomic anti-slip handle that keeps your hands comfortable even on long walking.]