Practical bicycle lock with a 100 cm long chain that can secure multiple bikes. It uses a digital 5digit combination. The lock has up to 100,000 possible passwords, making it resistant to cracking. Key benefits No key to carry or lose: digital 5digit combination for convenient unlocking Suitable for securing more than one bike with a single chain security with a large combination space (up to 100,000 passwords) Product features Chain length: 100 cm, enabling secure attachment of multiple bikes Lock type: 5digit password configuration, up to 100,000 possible combinations Durability: Chain lock cylinder made of zinc alloy for strength, smooth operation, rust resistance, and long life Tamper resistance: Designed to resist tampering and destruction Protective sleeve: Polyester sleeve to protect the chain from rust and to better protect bicycles Material and construction Zinc alloy cylinder provides strength and durability Rustproof design supports long outdoor use Protective polyester sleeve helps prevent rust on the chain and offers added protection to bicycles Use scenarios City commuting or errands: secure your bike to a rack while you run quick errands or visit shops Campus or gym: lock two bicycles together or secure your bike at the rack while you exercise Outdoor shopping or cafe stops: leave your bike briefly secured to a fixed object with confidence How to use (summary) Set your own 5digit password Align the digits to unlock If you need a code, reset your password using the lock's reset procedure