about this project Mode Changeable: Press and hold the horn for 3 seconds to change the horn tone mode. The bicycle handlebar electric horn has a built-in replaceable battery, which can ring 700,000 times. Universal Accessories: Bicycle handlebar electric horn with elastic band, easy to install, suitable for all diameters of handlebars, easy to use. Premium Quality: This brand new bicycle horn is made of high-quality silicone material, which is sturdy and durable. Not easy to damage, reliable quality and long service life. 90 decibels: 90 decibels bicycle bell, the sound is clear and loud enough to alert car drivers and pedestrians. With silicone sleeve, elastic and soft, will not damage the handlebar. COMPACT AND LIGHTWEIGHT: The Bike Handlebar Horn Alarm Electric Horn is light in weight and compact in size, available in 4 different colors. Dimensions (L*W): Approx. 10*3cm/3.9*1.2in