https://alexnld.com/product/dual-channel-vhf-handheld-wireless-microphone-receiver-system-with-adjustable-volume-control-two-cordless-lcd-handheld-noise-reduction-mics-for-home-ktv-conference-karaoke/?hilite="ERZhen 600GT UHF Wireless 4ch Handheld Microphone System for Speech Meeting"