The MXW2X/SM58 rechargeable handheld transmitter is ideal for presenters who prefer to hold a microphone or to pass around for Q and A. The SM58 dynamic microphone's cardioid pickup pattern reduces feedback and room noise. The transmitter operates for up to 25 hours with the included SB908 lithium battery pack and recharges quickly. Compatible with Microflex Wireless neXt systems.