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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Any mic that you try to use for karaoke with a Windows PC always has a slight delay but since this has a passthrough you can put your PC audio through the receiver box and then it adds the mic into it and it has no delay! Sounds quality is good, adjustments are good (gotta have the echo for a real Asian Karaoke experience!).