uxcell 12V 30W Warning Alarm Loud Siren Horn for Car 4 Sounds Tone PA System Voltage: DC 12V; Power: 30W Install Screw Diameter: 6mm/ 0.24 inches; Product Name: Car Siren Horn Material: Plastic, Metal; Package Content: 1 x Car Siren Horn Color: Black Dimension: 105 x 100mm/ 4.1 x 3.9 inches(L*Max.D)