This product is specially designed for bicycle. There are two modes (110db or 100db) for you to adjust the db of the bell to satisfy your different needs. Perfect choice for you. Features: This product adopts quality plastic and metal material, anti-rust and durable for long term use. Lightweight and small size, this product can arise no burden at all to your bike, bringing you with perfect riding experience. There are two modes (110db or 100db) for you to adjust the db of the bell to satisfy your different needs. Exclusive silica gel wire control switch which can be installed at many parts of the bicycle, more convenient to use. It is with extremely loud and clear sound and compatible with all bikes including road bikes. Specification: Item: Bicycle Horn Material: Plastic + Metal Colour: Black Size: Approx. 9.3 * 4.3 * 3.5 cm / 3.7 * 1.7 * 1.4 inch Weight: Approx. 112 g / 4.0 oz Suitable for Handlebar: 22-31.8 mm Battery: 2 * AAA (Excluded) Package Included: 1 * Bicycle Horn 1 * Support 1 * Screwdriver 1 * Manual .