Point Source Audio BBX-SH Back-Up Box For 4-Pin TA4F TransmittersConnect 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. Compatibility Point