The Sennheiser EW322 G3 Lavalier System ME4 is small but mighty. The clip-on microphone in this professional set is nearly invisible. The included cardioid pattern microphone has both great resistance to feedback and clear voice reproduction. The true diversity receiver means you get the highest degree of signal reliability at all times. Sync up the bodypack with the receiver with a single touch of a button and it enables a high quality diversity reception. Especially convenient is the fact that you can connect an external mute button (option) to the additional 2.5mm jack socket on the bodypack transmitter. With its sturdy metal housing, it has a 42MHz bandwidth, 1680 tunable UHF frequencies for interference-free reception, enhanced frequency bank system with up to 24 compatible frequencies and an ethernet port for connecting to the Wireless Systems Manager (WSM) software for control via computer; this delivers a good overview of monitoring and professional data management for multi-channel systems. It also has a pilot tone squelch for eliminating RF interference when transmitter is turned off and many mory innovative features. Included is 1 EM 300 G3 rack-mount receiver, 1 SK 300 G3 bodypack transmitter, 1 ME 4 clip-on microphone (cardioid), 1 GA 3 rack mount, 1 NT 2 power supply unit, 2 antennas, 2 AA batteries and operating instructions.