PG58 Head: The Shure PG58 head features a cardioid polar pattern and tailored frequency response for vocal and general instrument capturing. The cardioid pattern attenuates noise and ambiance at the off-axis sections of the microphone capsule * Automatic Transmitter Setup: The PGX2 transmitter features automatic channel and frequency setup via infrared sync between the transmitter and receiver * Audio Reference Companding: Shure"s Audio Reference Companding technology implements the companding process at the highest audio peaks only. The result is a more natural sounding audio signal, similar to that of a wired microphone * Long Battery Life: The PGX2 is powered for up to 8 hours on 2 AA alkaline batteries