ESV6203 is a wired vehicle-mounted alarm designed specifically for engineering vehicles, highway road work vehicles, highway maintenance vehicles and highway rescue trailers, with the core highlight of a high-definition intercom speaker function. The product is shipped with a default 12V DC power supply, which can be directly installed and used without additional modification. The intercom speaker has clear and loud sound quality with strong penetration, which can accurately transmit command instructions, safety reminders or warning information in noisy environments such as high-speed operation sites and road maintenance areas, effectively coordinating the operation process and ensuring on-site safety. As a wired alarm, it adopts a stable wired connection design to avoid wireless signal interference and ensure reliable operation of the intercom and alarm functions at critical moments. The alarm includes a wired host, a high-fidelity intercom speaker and supporting control components. The host has a simple and intuitive operation interface, supporting one-key switching between intercom and alarm modes, and is suitable for various vehicles such as cars, engineering vehicles and highway rescue trailers. The compact structure design saves installation space; the speaker can be flexibly arranged at the front or top of the vehicle to ensure unobstructed sound transmission; the wired host can be embedded in the cockpit for convenient operation without affecting driving.