... : 4 Ω-speaker;4.Function: > 8 tones and Microphone;5.Wireless Remote Control Electronic Siren;6.One way system;7.Double light controller ... 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 ...