Bluetooth microphone and speaker recently selected netizens affect the development of education in China over the past three decades, 10 technology products list, including wireless microphones because most teachers are welcome and ranked first, wireless microphones will not only help students improve the lectures effect, but also to ease the troubled education industry for many years, "laryngitis" and other teachers occupational problems. The current mainstream wireless microphone products for use in the classroom, mostly VHF FM, UHF PLL FM analog signal transmission main. Let's look at some of the problems the microphone used in the teaching practice exists, which you can see the direction of development for wireless microphones used for teaching. Immunity: The traditional V / U-band frequency due to the limited number of communication between a wireless microphone and matching receiver, and radio waves penetrating sound, it is prone to crosstalk between adjacent devices signal each other phenomenon. Speaker adjacent classroom or between the upper and lower floors of classrooms is likely to spread to other classrooms voice. Since the conventional wireless microphone is an analog signal propagation speakers, susceptible to noise of other frequency bands with radio wave interference. GM: Because the transmitter and receiver frequency correspondence, so the microphone is to be specially paired in school management, the use of different channels as possible to send the microphone adjacent classrooms speaker rankings, so between the various sets of microphones each other is not universal. Even for microphone FM point prior to use but also to adjust the channel to another channel without a microphone. Electromagnetic radiation: Some products wireless transmission power of 30 mW or more, to consider the long period of strong electromagnetic radiation environment have an impact on teachers' health. Environmental issues: they use a battery-powered wireless microphone monitors the way, not only because of the larger power needs frequent replacement battery powered speakers, but abandoned after the battery will cause damage to the ecological environment. Remote Horn Speaker Product Features: Two units divide number of high-frequency remote loudspeakers barrel; a 3 inches titanium diaphragm neodymium compression driver tweeter;; precise constant 60 ° X60 ° of one 15 inches high power woofer directional angle can reduce audio interference in order to ensure sound clarity; quality industrial resin casing; simple and convenient to install structural metal stents; fully waterproof design, waterproof and dustproof IP44, all-weather outdoor use Uses: can adapt to the complex environment of COSCO PA distance requirements; applies to fixed stadium PA system installed monitors | Speakers | Video provided by Wuhan Wuhan Jiuhua Jiuhua video Engineering Limited. Jiuhua Video Engineering Co., Ltd., Wuhan (www.jowa-tech.com) strong, credible, in Wuhan, Hubei control and adjustment equipment industry has accumulated a large number of loyal customers. The company better work attitude and constantly improve Wuhan Jiuhua innovative ideas will lead into the brilliant video and you work for a better future!