1.[Combination Unlock Way]This U-lock is suitable for use on bicycles, motorcycles or electric bicycle. It is unlocked with a password, no key is required, and you can leave the bike without a key. 4-digit password, there are 10,000 password combinations, high anti-theft performance 2.[Strong and Safe U-Lock ]The bike u lock is made of strong and durable zinc alloy material, which can prevent hydraulic shearing and sawing, so strong and wear-resistant, and has a long life 3.[Simple Appearance ]The appearance is black, the lock cylinder part and the lock body are made of special protection material zinc alloy one by one "galvanized", the outer layer of the lock cylinder is made of PC material, anti-scratch, more beautiful and more comfortable to use 4.[How to Setup Password ]Our U-shaped locks have a combination adjuster at the bottom. The design is simple and easy to operate, first dial the code switch from A to B, then set the password you need, after setting, dial back to the original position, the operation is fast and simple