Siren Type: Siren Power: 6 AG13 and LR44 Button Cells Color: Black Weight: 370g Keys: 2pcs Lock Pin: 0.7cm Decibel Siren: 110dB Dimensions: 8x7.3x3.3cm Bag Dimensions: 10x8x4.5cm Cable Length: 2m/ 6ft [Conversion: 1cm=0.3937inch, 1inch=2.54cm] Model: Waterproof Alarm Lock Material: Alloy Features: ● Universal security anti-theft lock for motorcycles, scooters, bicycles, etc. ● Works by locking disc brakes. The design of the mechanical lock cylinder is rigorous, and it is difficult to open without a key. ● Simple and convenient operation. Click on the lock cylinder and it will be locked. ● Supports warning prompt function. If someone hits the lock, there will be an alarm sound. ● With waterproof function, it will not rust in rainy days. Instructions for use: Press the lock cylinder, you will hear a "beep" when the lock is locked, and enter the alarm state. After 5 seconds, when the lock body or the vehicle vibrates, the lock body will send out three alarms 'du DU'', when When the lock vibrates again, it will alarm after 5 seconds and continuously vibrate. Each alarm lasts 10 seconds. It takes 5 seconds for the owner to unlock the lock. If the lock cannot be opened, the alarm will be used to unlock the lock with the key, and the alarm will stop immediately to replace the battery: when the sound of "crack..." is heard continuously or the alarm stops within 10 seconds, it means that the battery is almost dead. The battery is out and needs to be replaced. Turn the four screws with a wrench, remove the top cover, and replace the battery. Note the positive "+" and positive "-". Battery replacement: When replacing the battery, first unscrew the screw at the bottom of the lock, and then remove the cover to replace the battery.