I have been looking, unsuccessfully, for a small, battery-powered device that I can wirelessly stream music to. My house has an intercom system with an auxiliary input, but there is no power supply near the console. This would make it a pain in the butt to use an airport express or any other device that requires AC power. I'm looking for a small, battery-powered (disposable or rechargeable) receiver with either stereo mini or RCA outputs. Ideas?