Resists environmental damage Built with a robust strength zinc alloy shell that resists environmental damage, protecting internal components and delivering lasting durability. Convenient bike security Easy to unlock with a keyless 4digit password, enabling straightforward daily use and effortless locking and unlocking. access prevention Offers millions of password combinations, deterring unauthorized access and providing dependable antitheft protection for cyclists seeking peace of mind. Weather resistant protection Constructed with antirust components and designed to be waterproof and dustproof, delivering reliable performance in varied weather conditions. Specifications and features Material: strength zinc alloy Design: brake disc lock for bikes Access: keyless 4digit password Security: millions of possible combinations Weather resistance: waterproof and dustproof, antirust components Use scenarios Urban errands: lock your bike during short stops at cafes, stores, or quick errands while you secure it with a simple 4digit code. Daily commuting: secure your bike at work or school, enabling fast, reliable locking and unlocking between activities. Outdoor parking: leave your bike in outdoor or challenging weather environments with confidence, thanks to the lock's waterproof, dustproof, and antirust design.