4-Digit Code Push-to-Lock System - Keyless convenience: This bicycle lock uses a 4-digit code and a practical push-lock mechanism for easy opening and secure closing. No key is required, with intuitive operation for daily security. Weather Resistant, Durable Construction - Protection in the elements: The zinc alloy body with a robust shell minimizes weather-related damage and provides optimized protection for internal components, supporting reliable daily use. Compact and Versatile - Space-saving design: The compact form is easy to transport and store. It is suitable for motorcycle disc brake holes from 7 mm and larger. The lock also includes an integrated reminder cord for added user convenience. Enhanced Security Technology - High-security configuration: A variable number code system with over 1 million possible settings delivers ongoing theft protection for bicycles of all types. Use scenarios - City commuting and errands: Park your bike at stations or shops and lock with your 4-digit code. No keys to carry or lose, enabling quick access and peace of mind. - Short trips and campus use: Lock up while running quick errands or between classes in busy areas, then unlock with your code and continue on your way. - Motorcycle and scooter parking: Take advantage of the compact profile that fits through 7 mm disc brake holes on motorcycles, providing a versatile security option when parking away from home.