Specifications: Perfect to protect your shop, office, home, car, house or anywhere requiring protection. Only the user can unlock the alarm. It helps protect your bicycle well, and you don't need to worry about losing it. Effective remote control and alarm sensors. Super loud, simple to operate and easy to install. How to Use Password Settings & Changes The default password is ABCA. Press and hold the A button for 3 seconds. After you hear the beep, enter the initial password. After that, you will hear three beeps. You need to enter four new passwords in 5 seconds. After removing the battery for 30 seconds, the system will automatically restore the default password. Arming Press the B button for about 3 seconds, hear a beep prompt to enter the arming, and start alerting after 5 seconds. Unarming Enter the correct four-digit password in the armed state. In any state, enter the wrong password four times in a row, the system will lock the keyboard, any operation will be invalid, and the lock will be automatically released after 3 minutes. Type: Bike Alarm Lock Material: Plastic Battery: 1 x 9V Battery (Not Included) Features: Anti-Theft, Sound Alert, with Remote Control Suitable Handlebar Diameter: 3cm/1.18" (Approx.) Lock Size: 60mm x 95mm x 35mm/2.36" x 3.74" x 1.38" (Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes:(Battery Not Included) 1 x Bike Alarm Lock 1 x Remote Control 4 x Screws 2 x Nuts 1 x Anti-Lost Buckles