1.Beautiful out look , completely function , easy to operate , stable property, reliable quality , suitable for all kinds of cars ,Popular ones .2. Install the main engine in the hide place, does not destroy the chassis structure, and does not affect the cabs artistic.3. Widely applies in all the cars for the army, the public security, the fire prevention, rescues, transportation, project rescue and all places on vehicles and station, square, ships, wharf for warning. It is the most advanced, most fashionable, most has user-friendly in the alarm apparatus.   

4.Products can be modified as customers'requests.