120 large high decibel low volume speaker speaker square small shouting 30w watt outdoor waterproof 12v wired

Signal penetration powerful horn sound audio

The use of large deep tube design, amplification of mellow propagation distance, volume up to about 120 dB

Timely alarm sound that is pressed that is ringing

Connected to the power supply power on the sound, power failure does not sound, easy to use with the switch to use, that is, press the sound

Quality should be pursued in detail

Multi-directional rigorous testing of the quality of the guarantee