Vibration Sensing Alarm: This bike disc brake lock features a vibration sensor that an alarm when it detects any movementHigh Decibel Alarm: The disc brake lock is equipped with a high decibel alarm system, producing up to 110 decibels of sound, loud enough scare offKeyless Locking and Sturdy Design: The lock can be easily secured without a key, making it convenient for daily use. It is also waterproof, dustproof and rust resistant, ensuring longevity and reliability in any weather conditionsZinc Alloy Shell: The outer shell of the disc brake lock is made from zinc alloy for enhanced durability and strength, providing extra securityPackage Includes: Each package comes with 1 disc brake alarm lock, 2 keys for manual if needed and 1 reminder cable to prevent accidental riding away while the lock is engaged Specification: Material: Alloy Size Chart: 8.5cmx3.1cmx5.6cm/3.35inchx1.22inchx2.2 inch Package Includes: 1x Alarm Disc Brake Lock2 Keys1 Reminder Cable Note: Please allow slightly errors 1-2cm differences due to manual measurement. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia