I'm thinking like those iPod ear buds, but make them wireless. Rather then use RF frequencies, you could use IR to save space. The IR module wired into the circuit would be enough to pulse the signal. They could be powered by those hearing aid batteries, and the IR LED could be connected to the 3.5mm jack on the iPod, its provides more then enough voltage, and it would pulse with the music. The only problem is that the audio would be mono. Any serious flaws or a way around the mono problem? I would prefer to use IR, considering its easier and would save space. Range isn't really a problem (form your pocket to your ear.) Hearing aid batteries last about 150hours. My other idea is that we could use those over-the-ear ear buds. Then build the the antenna into it. Meh, any suggestions? I'm not great at this sort of thing, but I'm trying. I've built RF receivers / transmitters before, but the coils and everything are too large for this type of project. My IR receivers/transmitters are pretty small.