Hay,
We never brought the wireless product to market because we could not get it to be stable in all the environments we tested it in. Sometimes it would loose its lock to the transmitter and we were concerned that would just be irritating. The larger cabinet was to house the battery. The battery would run the speakers for about 24 hours of straight reasonably loud playing. This would allow you to take high quality music anywhere around the yard or down to the dock if you were at the cottage. They had a charger unit that plugged into the wall and supplied 12 volts to the speaker. If you were using them in a permanent location you would just leave them plugged in all the time.
