PA Horn Speaker with Four Driver Units for Civil Defense Siren System If you want to find a high power, high volume remote horn speaker for outdoor use, don't worry about it at all. This Air Defense Siren Speaker has durability and sealing property. Its sealing structure can effectively isolate the entry of rain and dust. Its waterproof level can reach IP66. It is absolutely no problem to use it in harsh environments. This horn is made of all aluminum materials and is equipped with four high-quality and efficient sound heads, You can match different power heads according to your requirements Minsheng Electronic has standardized workshops, mold development and manufacturing workshops, hardware, electronics, engineering and other workshops. Over nearly 20years, Mingsion has established long-term and stable business relations with many customers at home and abroad, Minsheng Electronic has been recogniz…