The JTS AAB-L is an arm bag which safely holds wireless microphone transmitters of the type that are used with aerobic headset microphones and ear hook microphones. IT fits JTS PT-990 transmitters and various other manufacturers wireless transmitters measuring up to 78mm wide x 34mm deep and 106mm high. It is padded and comfortable to wear for long periods and is ideal for aerobics instructors, Zumba teachers, cheerleaders and dance classes.