Description: 【Multifunctional Sound】: This Car Speaker can emit 7 loud and clear alarm sounds. Each button triggers a different sound, including sirens, ambulance sirens and police whistles. It is premium for various emergency situations. 【Durable Material】: This Car Speaker is made of pp material, which is durable and has a long service life. 【Clear Sound Projection】: Equipped with a microphone PA speaker system, the sound can be heard clearly even at a long distance. Great for alerting others in noisy environments. 【Widely Applicable】: Car Speaker is suitable for most vehicles, including cars, trucks, boats and motorcycles. 【Easy to Install】: The installation process of Car Truck Alarm Speaker is very simple, connect the red wire to the positive pole and the black wire to the negative pole. Specification: Notice: The power supply voltage should meet the working voltage, otherwise it will not work properly. The wiring must correct or it will not work. Speaker wires should be protected from short circuits. When shouting, your mouth should be loudspeaker. If it is from a certain distance, the effect of shouting will be much worse. Size Chart: Speaker:16.7cmx15.8cm/6.57inchx6.22inch Megaphone:10.3cmx6.4cm/4.06inchx2.52inch Package Includes: 1 speaker 1 megaphone Note: Please allow slightly errors due to manual measurement and different monitors.