Item specifics:Size: 9CM (diameter)Color: black + redSupply voltage: 12 (V)Caliber: 3 (mm)Impedance: 8 ()Voice coil: AVSWorking temperature: -10-60 ()Diaphragm material: plasticWeight: 490 gramsFrequency: 410Hz low frequency 510Hz high frequencyRated power: 100WPeak power: 120WPronunciation Unit: DualCharacteristics:Our 300DB Train Horn offers the loudest sound on the market while being the most compact train horn. The Train Horn is a high quality, high end train horn kit that can be fitted to as many trucks as possible. What's more, the installation process takes less than an hourOur horn features an extremely powerful direct-injected mini-compressor and patented scroll design to really charge and amplify the sound All integrated in one small but powerful device There's no bulky air compressor, just a small device that produces an incredible sound It's so compact that almost HALF our customers buy and install 2 horns to double the volumeZughorn is suitable for almost every vehicle While our horn is the perfect upgrade for trucks, it's also compatible with SUVs, cars, boats, and motorcycles. As mentioned, the installation process takes less than an hour and is easy to do. Instructions and everything you need is includedDiscreet, compact black design300DB volume, the most powerful on the marketLoud, clear and deep train-like soundEasy installation, manual included with every purchaseMade from high quality metals and an ABS construction that will not oxidizeComplete water and weather resistanceScope of delivery:Horn * 2Installation accessories * 2 setsNotes:1. Due to different measurement methods, the measurement allows an error of about 2-3 cm. This situation is not a quality problem. (1 inch = 2.54 cm)2. Due to different lighting and screens, the color of the product may vary from the original color. Please prevail in kind.