Professional wireless microphones, Junya Electronics (certified), Enping microphone provided by Junya electronics factory. Enping Junya Electronics Factory (shop1394643557089.1688.com) is specialized in the "electro-acoustic products and accessories," the enterprise, the company of "honesty, hard service" concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Zeng Shenandoah. UHF-301 Tips: Quartz Lock (Qualtz LOCked) machine types: quartz oscillator to generate the transmit and receive accurate and stable fixed-frequency microphone, simple circuit designer microphone, low cost professional wireless microphone, a standard circuit design of today's wireless microphone. This type of microphone and receiver only a single fixed frequency paired with a microphone wholesale and retail, you can not change or adjust the frequency of use. UHF-501-B Tips: If the wireless microphone mute switch is turned on only by the operator when the program alternately listening with headphones. In order to prevent the occurrence of wireless microphone without sound phenomenon, usually mute switch should be fixed with adhesive tape