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Bosch lh1-uc30e music horn speaker has a two-frequency system that produces a wider range of frequencies and higher sensitivity, providing superior voice and sound reproduction effects. The basic function of the rectangular horn speaker is written by a reentrant horn and two transducer (one for the low frequency, and the other one for the high frequency) to form the unique combination of, can produce no with Aaron than speech intelligibility. This horn speaker is waterproof, so it can be used in high humidity. Therefore, it is suitable for outdoor applications (such as sports ground, sports ground, leisure park, exhibition area and passenger terminal) as well as indoor public broadcasting system. The ABS horn speaker and the aluminum mounting frame are all covered with a light gray coating RAL 7035. LH1 UC30E is designed for voice alarm system, and has been certified by EN 54-24, meeting BS 5839?8 and EN 60849 standards. The horn speaker has built-in protection. In case of fire, this protection function can ensure that the damage to the loudspeaker will not lead to the circuit connected to it. In this way, the integrity of the system is maintained, ensuring that speakers in other locations can still communicate to people in a timely manner. The horn loudspeaker is equipped with ceramic junction box, thermal fuse and high temperature resistance wire. Optional circuit/speaker monitoring board can be installed inside. All Bosch speakers are certified to meet IEC 268-5 power handling capacity (PHC) standards and can operate continuously for 100 hours at rated power. Bosch has also conducted simulated acoustic feedback exposure tests to ensure they can withstand twice the rated power in a short period of time. This ensures high reliability of the speaker under extreme conditions, improves customer satisfaction, extends service life, and significantly reduces the probability of failure or performance degradation. Security in accordance with EN 60065 standard emergency conform to 24 / BS EN 54 ? ? eight 5839 / EN 60849 standard flame retardant ABS in accordance with UL standard 94 V 0 waterproof and dustproof conform to IEC 60529, IP 66 standard wind conforms to the NEN 6702 + A1, Bft 11 certification European CE standards area CE DOP CPD installation/configuration horn speaker built-in 70 V and 100 V transformer, Different power Settings can be selected by tapping on the primary coil. By connecting to the corresponding tap, you can easily select the rated full power, half power rate, quarter power, or eighth power (increase by 3 dB).