Usage Tips:【 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 【Strong and Safe 】The whole lock body is formed of special environmental protection material zinc alloy, which can prevent hydraulic shearing and sawing, is strong and wear-resistant, and has a long service life 【Simple Appearance 】The appearance is black, the lock cylinder part and the lock body are made of special environmental 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 【How to Change 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 【Widely Application】This U-lock for bikes outside can be applied to all types of bicycles, and can be widely used in bicycles, office doors, warehouses, gates, fences and store doors. With our bicycle U-lock, you can get maximum security