PA300 is a PA system alarm amplifier designed specifically for emergency vehicles, mainly compatible with special vehicles such as ambulances and Cop cars, while also suitable for engineering vehicles, highway road work vehicles, highway maintenance vehicles and rescue trailers. The product integrates a high-fidelity PA system and multi-tone alarm function, presetting a variety of warning tones, including ambulance-specific sounds and siren sounds, which can be flexibly switched according to scenarios; it is equipped with a high-definition intercom speaker with loud sound quality and strong penetration, which can accurately transmit command instructions and safety reminders in noisy operation sites or emergency rescue scenarios. It is shipped with a default 12V DC power supply and can be installed and used directly without additional modification. The alarm includes an electronic alarm speaker, a PA system host and supporting control components. The host has a simple operation interface, supporting one-key switching between multi-tone alarm and intercom modes, and is compatible with various vehicle models. The compact structure design saves installation space; the speaker can be flexibly arranged on the top or front of the vehicle to ensure unobstructed sound transmission; the host can be embedded in the cockpit for convenient operation without affecting driving.