Samson AX1 Plug-in Handheld Wireless XLR Transmitter, Channel N3/644.125 MHz, 50Hz-15kHz Frequency Response, 2k ohms Input Impedance

The Samson Ax1 Plug-in Handheld Wireless XLR Transmitter (Channel N3/644.125 MHz) plugs into any standard dynamic microphone to make it wireless. It is small and lightweight feels like it's a natural part of the mic. It contains contains a built-in electret condenser microphone and connection for an optional lavalier microphone. The Ax1 operates on inexpensive and lightweight AAA batteries that offer 14 hours of operation on a single battery.