Specifications: Adopt micro-computer technique, have high-middle-lower sensitivity choose. Low power consumption to allow the battery a long life. Attach permanently to your bike without worrying about having to remove it in bad weather. Item Name: Bicycle Alarm Material: Plastic Current: 105db Working Temperature: -15℃ - 75℃ Storage Temperature: -40℃ - 85℃ Humidity: 5% - 98% Suitable for Tube Size: 3cm/1.18" (Approx.) Battery: 1 x 6F22 9V Battery(Not Included) Features: Low Power Consumption, Easy Installation, Security Alarm Notes: 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. Package Includes: 1 x Bicycle Alarm 2 x Screws 1 x English Chinese User Manual