Keyless 4-digit security: Set a custom 4-digit code and push to lock or unlock. No keys to carry or forget, offering simple handling for everyday use. Durable and weather resistant: Zinc alloy construction with a robust shell protects internal components from the elements, delivering reliable performance in daily use. Disc brake protection and compatibility: Designed to protect components around disc brakes with hole diameter over 7 mm. Lightweight and easy to transport, and supplied with a reminder cord to help you keep the code handy. High security and protection: Millions of possible code combinations, combined with robust locking technology, form a tailored theft protection system that helps deter unauthorized access. Portable and convenient: Lightweight build and included reminder cord ensure the lock is ready to use when you need it, whether you’re commuting, running errands, or leaving your bike unattended. Use scenarios: - City commuting: Lock your bike at transit stations or on busy bike racks during short stops, without worrying about keys. - Campus or urban errands: Keep your bicycle secure at the library, dorm, or shop while you focus on tasks. - Weekend rides or trailheads: Use it for quick stops on longer rides, ensuring fast access when you return to your bike.