Feature: 1. Security anti-theft lock universal for motorcycle, scooter, bicycle etc. 2. It works by locking the disc brake. 3. Simple and convenient operation. Click the lock cylinder, it will be locked. 4. Support warning alert function. There will be alarm sounds if the lock is shocked by someone. Specification: Color: Black, Green, Yellow, Silver, Red,Bronze. Material: Zinc Alloy. Lock pin: 0.7cm. Alarm decibel: 110dB. Size: 8 x 7.3 x 3.3cm. [Conversion: 1cm=0.3937 inch, 1inch=2.54 cm] Usage Instruction: 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 alarmDU 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 cant 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-. Warning: In order to replace battery easily later on,please keep this usage instruction and small spanner. Note: 1. Due to different producing batches, product details might be a little different. If you minding the difference, please buy it carefully. 2. Please allow 1-3CM differs due to manual measurement. 3. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. Package Included: 1 X Alarm Disc Lock. 2 X Keys