If you're a fitness instructor, these deluxe mic belts will hold your battery pack transmitter from all the major wireless brands such as Shure, AKG, Mipro, Chiayo, Fitness Audio, Sennheiser, JTS and others. It will also hold different types of smartphones or iPods® if you listen to music while you walk, jog or run around the park. PouchBelts feature an adjustable buckle for waist sizes up to 96cm with a standard vertical pouch.