The teacher microphone for classroom built-in 2400mAh large lithium battery, it provides 10days keep using. The charging time of portable rechargeable mini voice amplifier takes only 4 hours to fully charge, but plays up to 20 hours of amplify time and up to 13 hours of music playtime.
The portable mic and speaker portable comes with an adjustable band that you can use it to tie around your waist or hang on your neck. The portable microphone headset with speaker has a clip on the back, you can clip on a belt or the pant waistband. The microphone for classroom teachers is lightweight and adjustable. You can adjust the distance between the microphone and mouth with its flexible gooseneck.
Please keep the personal voice amplifier for teachers for a distance and facing away each other to avoid the signal affected. Please charge portable speaker with microphone amplifier before first time using. It is a best portable voice amplifier for teachers, trainer, singer, coacher, tour guide, shopping mall, presentation, outdoor speech and etc.