Amazon.com.au:Customer reviews: Bluetooth Wireless Microphone with Echo, Treble, Bass, Professional UHF Dual Handheld Dynamic Karaoke Microphone System, 160 Ft Range, for YouTube TV Karaoke, Party Singing, Speaker System, iPhone
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Not really what I hoped for. The UHF mics don't really deliver the best quality sound and YES there is a delay, not huge, probably half a second but enough to throw you off the pace of the song. I don't think at this point there's something better than wired mics. Can you still use it? I guess so but I do like to sing, this won't cut.
I connect to my sound system. Normally I connect other devices but through this sound comes very weak and you need to keep attached to your mount. Mics are not picking up from over an inch from your mount.