The lightweight and comfortable headset microphone in the Sennheiser ew 352 Headset Wireless System gives you absolute freedom of movement for a more animated and impressive performance. Its high-quality condenser technology provides clear, brilliant sound. An added special feature of all rackmountable Sennheiaser G3 300 series receivers is that they're equipped with an ethernet port. With ethernet you can monitor and remotely control the system from a PC with the included Sennheiser's Wireless Systems Manager software.The Sennheiser ew 352 Headset Wireless System includes an EM 300 G3 rackmount receiver, SK 300 G3 body pack transmitter, ME 3-ew headset microphone (cardioid), GA 3 rack mount, NT 2 power supply unit, 2 antennas, 2 AA batteries.