All-round anti-saw and anti-drill design delivers strong resistance to cutting and sawing attempts. Night visibility features help you locate your bike quickly in low light thanks to reflective surfaces. Security specifications: - 5 digit password lock - alloy steel lock - anti-theft cylinder Waterproof and dustproof protection: - the chain is enclosed in a protective fabric cover - this cover helps prevent rust and scratches Key benefits: - enhances security against theft with durable materials and anti-cutting features - convenient access with a 5-digit combination, no key required - reliable protection against rain, dust, and abrasion 2-3 practical use scenarios: - urban commuting or shopping: secure your bike to public racks during short errands with a quick 5-digit code - campus or transit hub: high-traffic areas benefit from fast, keyless access and strong anti-theft features - outdoor storage or long-term parking: weather exposure is mitigated by the waterproof and dustproof fabric cover that shields the chain from rust and scratches