Portable Voice Amplifier, Blutooth Waistband Voice Amplifier Rechargeable Speaker With Personal Mic For Tour Guides, Teachers, Coaches, Lectures, Costumes

Put the microphone in front of your mouth to get the maximum amplification effect. ^
Do not whistle: keep a certain distance between the microphone and speaker, preferably facing each other. ^
The best way is to put on a microphone headset, hang the amplifier speaker on your waist, turn it on and gradually increase the volume as needed.^