Description: 【Versatile Alarm】: This bicycle bell alarm is suitable for various vehicles including bicycles, electric bikes, motorcycles, and skateboards. 【3D Displacement Sensor】: Equipped with a 3D displacement sensor, this bike alarm can detect movement, collision, and tilting instantly. 【Loud and Clear Sound】: With a sound level of 105 to 115 decibels, this bicycle bell alarm has strong outdoor power that can be heard clearly from a distance. 【Long Control Distance】: The control for this bicycle bell alarm has an effective range of 10 to 80 meters in open areas, providing you with ample distance to activate or deactivate the alarm as needed. 【Sturdy and Waterproof Design】: Made from premium PP material,the bike horn is sturdy and suitable for long term use. Specification: Material:PP Size Chart: Bike Horn:4.4cmx3.1cmx4.9cm/1.73inchx1.22inchx1.93inch Controller:5.8cmx3.5cmx1.5cm/2.28inchx1.38inchx0.59inch Package Includes: 1 Main Unit 1 Tube Bracket Silicone Pad 1 Controller with Bracket Installation Screws 2 Cable Ties 1 Charging Cable Note: Please allow slightly errors 1-2cm differences due to manual measurement.