Description 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. Usage Instructions: Press the lock core,it will be locked and you will hear the sound "DU", which means it is coming into alarm status,after 5 seconds,When the lock or vehicle is vibrated,the lock will give an alarm"DU DU DU" three sounds,when the lock is vibrated again,after 5 seconds,it will give an alarm and keep alarm with serial vibration.Eeach alarm will last for 10 seconds. It will cost 5 seconds to open the lock for the owner,if the lock can't be opened,it will give an alarm.Use the key to open the lock,the alarm will stop at once. Battery Replacement: When your hear the sound "Ge,Ge,Ge..."constant voice or the alarm sound less than 10 seconds and stop at once,that means the battery will be used up,you need to replace the battery.Please use the provided spanner to spin out the the four screws,take away the top cover and replace the battery.Please pay attention to the anode"+" and cathode"-" Package: 1 anti-theft lock + 2 keys + 6 batteries