Audio Technica ATW-2120CI Wireless Handheld Microphone System - I Band ATW-2120C
ATW-R2100c receiver and ATW-T220c handheld cardioid dynamic microphone/transmitter. Handheld Transmitter Pin 3: MIC INPUT. Four-pin Locking Connector. Pin 2: INST INPUT. Input Connections Depending on battery type and use pattern.