Private Radio Microphone/Wireless microphone 1:Wireless 2:Used widely 3:High sensitivy Wireless Microphone Features: IMPEDANCE:250ΩSENSITIVITY(AT 1 KHZ):.-43dBDIMENSIONS(L ... years guarantee. We've specialized in conference system,broadcast system,speaker,amplifier for 12 years, any interest in our company, please ...