Features: Security anti-theft lock universal for motorcycle, scooter, bicycle etc. It works by locking the disc brake. Simple and convenient operation. Click the lock cylinder, it will be locked. Support warning alert function. There will be alarm sounds if the lock is shocked by someone. Specifications: Color: red, green, black(optional) Material: metal Lock pin: 5.5cm Alarm decibel: 110dB Package size: 18.5 * 12 * 4cm / 7.3 * 4.7 * 1.6in Package weight: 562g / 19.8oz Package List: 1 * Lock 3 * Keys Note: Press the key cylinder to lock with a "beep" sound, it puts on alert in 10 seconds accompany with a vibration and three "beep" sound. If the lock is shaked, another shake after 5 seconds will cause alarm, and hereafter continuous vibration can bring continuous alarm. No shake occurs within 10 seconds after the alarm, it will be on alert again. Battery Replacement: When replacing the battery, first unscrew the screws at the bottom of the lock, then remove the cover to replace the battery.