Press the unlock button, the lock will automatically pop out, just pull it out.Can be fixed to most cylindrical objects, such as round pillars, chair handles etc.The rope adopts high light and flash design to enhance the eye-catching degree at night, making it safer to travel at nigh.The rope minimum can eject 37.4'', the longest can eject 63''adjust the best length according to your height and dog walking habits, and you can walk your dog happily.