Compatible with Shure Body-Pack Transmitter Models: T1, ULX1, UR1, PG1, PGX1, PGXD1, SLX1, BLX1, BLXD1. (Not Compatible with Mipro, Peavey, Beyer wireless microphone system) * Directional Characteristics: Noise Canceling * Frequency Response: 100 Hz ~ 10,000 Hz * Sensitivity: -66 dB +/- 4dB & Impedance: 600 ohm * Operating Voltage: 1.0V- 10V D.C.