uxcell 12V 110dB Waterproof Motorcycle Truck Loud Snail Shaped Siren Horns 510Hz Product Name: Motorcycle Siren Horn; Material: Plastic,Metal Package Content: 1 x Motorcycle Siren Horn; Color: Sliver Tone Dimension: 10 x 8 x 7cm/ 4 x 3.1 x 2.8 inches(L*W*H); Battery Included: No Rated Voltage: DC 12 V; Mounted Hole Diameter: 8mm/ 0.31 inches Frequence: 510Hz; Volume: 110dB