How this Wireless microphones system so cheap yet holds almost all the features the big ones have?

Grab yours from AliExpress: https://s.click.aliexpress.com/e/_DEv...
Grab yours from Amazon: https://amzn.to/48PDRvt

Music from Uppbeat (free for Creators!):
https://uppbeat.io/t/infraction/summe...
License code: IWSREMCNFDJVBKAO

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