We use this model to clean the on-stage sound, more IEMs means less stage monitors and therefore much less bleeding.
We have 10 of them, using top-quality batteries, they last nearly one day with two rehearsals and the show. Easy to set up, easy to use, can be clipped to the belt, good sound and appropriate volume when using quality earpieces. Indeed, if you require stereo IEMs, pick another model, but we prefer laying twice less cables onstage an keeping mono IEM :-)