? 7 SIREN SOUNDS: The car siren speaker can offer 7 loud and clear sounds, includes hooter, fire alarm, ambulance, traffic, police, etc. Please don’t use siren when emergency situation happened. ? WIRELESS REMOTE CONTROLLER: Easy to operate, control the horn with the button. Button A: Tone 1?Button B: Tone 2, press to stop the siren?Button C: Tone 3?Button D: 4 Different Tones, press to change tone. ? INSTRUCTIONS: Power siren with 12V or car battery. The supply voltage should meet the operating voltage and please make sure the cable connection is correct, or it will not work properly. ? LOUD AND CLEAR: The sound car siren is handy but loud and clear for its size. Please Not to be used as a replacement for professional equipment siren. ? PREMIUM QUALITY: The sound car siren is constructed from premium quality materials to ensure maximum strength and durability for long lasting usage