AntiTheft Combination Lock: The 4digit antitheft code design enables key access, delivering convenient, quick releases while maintaining strong security for your vehicle. Advanced Theft Protection: A reinforced lock core and drillresistant alloy create a tamperproof structure with an anticut mechanism, offering a solid bike lock option designed to prevent breakins. WeatherResistant Build: Nonfading surfaces with a paint protection layer, wearproof material, and a scratchresistant coating provide longlasting use in various conditions. This design ensures dependable security with minimal maintenance and effective resistance to environmental damage. Versatile and Compatible: A flexible, adjustable chain mechanism supports multiscenario use and practical helmet storage, along with compatibility with common lock systems. Use scenarios: Urban daily use: Park your bike at shops or transit stations and secure it with a 4digit code for quick access without carrying keys. Multibike or shared spaces: Secure several bikes at apartments, campuses, or bike racks using the adjustable chain, while providing space for helmet storage. Outdoor and variable weather: Rely on weatherresistant construction for reliable performance during rides in rain, sun, or varying conditions with minimal upkeep.