Applied Microphone Technology Wsi Inline Series Instrument Condenser Microphone - Cardioid Includes Inline Preamp - Phantom power required. Compatible with AMT Wireless, Shure, Sabine, & Line 6 wireless systems with the included cable. Designed, manufactured by hand, and distributed by AMT in the USA Works with all AMT power supplies & preamps. Compatible with Sennheiser wireless with optional cable.