Connect a redundant microphone to a single transmitter using this BBX-SH Back-Up Box from Point Source Audio. The box itself features two female 4-pin TA4F connectors which accept two CONFIDENCE dual-element lavalier microphones while a male 4-pin TA4F connector inserts into your compatible Shure transmitter. This is especially ideal for live event productions where your talent requires a contingency plan if one microphone fails.