The item is a universal practical anti-theft bike lock to protect your bike from being stolen. It has a vibrating sensor system, if the is moved by the , the alarm will go off with 110dB ultra strong alert sounds for about 20 seconds, good security anti-theft . The can be used for locking most kinds of bicycles including and road bike to keep your riding partner safe. Feature - Color: Black - Material: Plastic - Size: 12 x 5 x 5 cm - Latch diameter: 7mm - Suitable For: Bicycle - Sensor Type: Vibrating sensor - Power Supply: 9V Battery (Not Included) - Alarm Volume: 105dB - Anti-Theft. Adopts professional anti-theft tamper proof lock core to be scarcely opened by other keys, keeping your riding partner and your belongings safe. - Wireless vibration alarm with infra-red remote control. distance can reach up to 10m, open surroundings will be better, sometimes reach up to 30m. - Auto-alarm and system. Easy to lock. Directly press "A" button to enter armed status, one "DU" sound indicates, press the "B" button to quit the armed status, double "DU" sounds indicate. - Vibrating sensor system. If the is moved by the someone, the alarm will go off with 110dB ultra strong alert sounds for about 20 seconds. Good security against theft. - Simple to operate and easy to install. Fit for most bikes, including and road bikes. - Warm tip: When the alarm sound becomes too low, the battery needs to be replaced. Notes 1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you for your understanding! 2. Please allow 1-3cm measuring deviation due to manual measurement. Package list: 1 x Anti-Theft Alarm (Battery Not Included) 1 x Remote Controller 4 x Screws 2 x Nuts 1 x Manual