Google Chromecast Audio: Stream your favorite music with Google Chromecast Audio. Simply plug into your speaker's auxiliary input and connect to your Wi-Fi network. Then just tap the Cast button from your favorite apps on your phone, tablet or computer to cast songs, radio stations and podcasts to your speaker.
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Great quality audio over wifi but setting up AudioCast on my iphone and ipad was a bit challenging. It only worked when I updated my iOS to latest version. Also does not appear to wake up the receiver so that has to be done manually.