The MXW2 Handheld Transmitter with SM58 Microphone Capsule from Shure is a bi-directional handheld transmitter designed to be used with the Microflex wireless conference system. It features an interchangeable SM58 microphone capsule. The handheld transmitter has dual transmit antennas to provide additional transmission strength, depending on hand placement. The MXW2 is capable of a range of operation of up to 160-feet. Its built-in rechargeable battery can provide up to 15 hours of use.