The Phase III Reflex Horn Alarm Speaker Siren is a black 5" siren designed for use in CB radios and other radio communication devices. With a resistance of 8 Ohm, this speaker is manufactured in Taiwan and is ideal for creating loud and clear alarm sounds. The Phase III brand ensures quality and reliability, making it a durable and effective choice for emergency or alert purposes. CB radio PA or for car alarm shipping to USA lower 48 only.