【Portable and Convenient】The bicycle U lock measures 350 x 112mm/227 x 112mm, lightweight and easy to carry and store. It is widely used for mountain bikes, road bikes, folding bikes and glass doors, etc. to provide you with safety protection. 【Keyless Convenience】This bicycle lock has a 4-digit code, there are 10,000 password combinations, high anti-theft performance. So you don't need to carry a key with you, very convenient. No more worrying about difficult unlocking, lost keys or broken keys. The U-shaped lock is strong and durable, locking and unlocking is very smooth. 【Simple appearance】 The appearance is black, the lock cylinder part and the lock body are made of zinc alloy, a special environmental protection material, 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 the password】 Our U-shaped locks have a combination adjuster at the bottom. The design is simple and