The frequency range is between 563.1- 595.1MHz. The karaoke wireless microphone has the function of locking the frequency, so that the wireless signal can be connected stably without interference from surrounding signals.
eBay
Portable Wireless HIFI Bluetooth Speaker Home Theater Sound System with Wired Mic High Definition Pure Sound U Disk TF Card AUX
Aliexpress UK
How to change the frequency of M23 The frequency range is between 563.1- 595.1MHz. Suitable For Party Speakers, It can be connected to any speaker with a MIC interface by connecting the wireless receiver, or it can be connected to the mixer as an extension of the wireless microphon.
eBay
ZEALOT-S69M Karaoke Machine Portable Bluetooth 5.3 Speaker System with 1 or 2 Wireless Microphones Home Family Singing Gifts
Aliexpress UK
K12 Bluetooth Karaoke Machine Portable 5.3 PA Speaker System With 1-2 Wireless Microphones Home Family Singing Children's Gifts
Aliexpress UK
SANSUI T93 60W powerful stereo party speaker outdoor portable karaoke sound system wireless Bluetooth with microphone TF/AUX/USB
Aliexpress UK
XIKCU Portable Karaoke Bluetooth 5.3 Speaker Machine PA System with 2 Wireless Microphones Home Family Singing Children's Gifts
Aliexpress UK
Karaoke Bluetooth Speaker Wireless Dual Microphones Machine KTV DSP System HIFI Stereo Surround For Kids And Adults Party Gift
Aliexpress UK
K12 Bluetooth Karaoke Machine Portable 5.3 PA Speaker System with 1-2 Wireless Microphones Home Family Singing Children's Gifts
Aliexpress UK
Bluetooth Speaker K12 Karaoke Machine Portable 5.3 PA Speaker System with Wireless Microphones Home Family Singing Children's
Aliexpress UK