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. Using Method: Press the red button for anti-theft setting, and you will hear a reminder sound; Press the grey button for canceling anti-theft setting, and you will hear a reminder sound; 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: 9.8cm x 3.7cm x 6cm/3.86" x 1.46" x 2.36" (Approx.) Notes: You will find more amazing products if you visit our store. Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Due to different manual measurements,allow for slight size differences. 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 Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.