Features: 1.Practical emergency alarm horn kit, including 1 x alarm, 1 x megaphone, 1 x control module and 2 x mounting accessories. 2.100W siren, 125db high volume, gives a loud and audible sound even when you are in a distant place. 3.With 5 distinctive sounds that is really helpful in your activities such as fire alarm, wailing ambulance, etc. 4.Built?in public?address system, allows you to talk to others with this mic in the car, convenient for using. 5.Easy to install and use, can be installed in any place with 12V DC power supply, which has wide applications. Specification: Item Type: Car Alarm Horn Material: ABS Voltage: 12V Power: 100W Current: 3A Sound Level: 125db Suitable for: 12V universal How to Use: 1. Check the battery 2. The black wire is connected to the negative pole, and the red wire is connected to the positive pole, the yellow wire is connected to the horn. 3. Fix the mounting position with tapes 4. Ready to use