The Sennheiser G3 In-Ear Monitor Kit is a professional system featuring an adaptive-diversity receiver, the receiver pack uses the headphone cable as a secondary antenna for flawless reception.Gel ear inserts reproduce the signal from the adaptive diversity receiver precisely and faithfully. Pass-through outputs allow easy splitting of the input signal to travel to other devices. The 5 band equalizer integrated in the transmitter also allows you to personalize the sound even further.