How to pair #RETEKESS TR503 wireless microphone with TR619 voice amplifier?

Recently, it is the back to school season. Students will back to school to study. students and teachers need to keep distance. And they need to wear the masks, so the voice will be influenced. That will make the teachers more difficult to talk to students. TR619: PR16R: Retekess official contact information: Web: Email: ali-express@ WhatsApp: 86 15638550861 Facebook: