Key benefits Keyless convenience: a 4digit combination lock allows quick release without carrying keys, simplifying access and reducing the chance of lost keys. Strong protection: reinforced lock core and drillresistant alloy provide resistance to cutting and tampering, delivering solid antitheft performance. Durable protection: nonfading finishes, scratchresistant coating, and a protective paint layer help maintain appearance and performance in harsh weather and daily use. Flexible security for multiple bikes: an adaptable chain system supports securing more than one bike. What this lock includes and how it performs Material and construction: reinforced lock core with a drillresistant alloy design for enhanced strength; anticut mechanism to deter forced entry. Finish and durability: wearproof materials combined with a scratchresistant coating and protective paint layer to resist daily wear and environmental exposure. Compatibility and versatility: designed for secure multibike use with an adaptable chain system; suitable across diverse environments and bike setups. Function and reliability: operates without keys, using a 4digit code that can be set and reset as needed; built to deliver consistent security performance over time. 23 practical use scenarios Urban commuting: park your bike at subway stations, bus stops, or busy streets with confidence, knowing access is controlled by a 4digit code. Campus or gym parking: secure a rider's bike in student housing areas or fitness centers where multiple bikes may be present; the adaptable chain system helps manage several cycles and reduces clutter. Family or shared bikes: secure multiple bikes in a rack or garage setup. Notes for use Keep your 4digit code confidential and regularly update it to maintain security. Inspect the finish and coating periodically; clean with mild soap and water to preserve the scratchresistant surface. Use the relevant feature as intended.