Portable Voice Amplifier for Teachers 2200mAh Rechargeable Personal Amplifier Mic PA System Headset Microphone with Speaker for Teachers Tour Guide

Small Size and Powerful Sound The personal voice amplifier is mini in size and light in weight size 3.6 x 2.8 x 1 inches and weight 0.4 lb), but with up to 8W output crystal sound and no noise. the sound of microphone speaker is loud enough to cover a large room of 25-100 people. Multifunctional Teacher Microphone This microphone for classroom teachers supports MP3 audio playing: TF Micro SD card playing USB flash drive playing. Portable microphone headset can repeat single tune, loop all music and switch songs. The portable microphone and speaker has 3.5mm jack, can work as a wired speaker. 2200mAh Rechargeable Voice Amplifier Mini voice amplifier has a built-in a 2200mAh large lithium battery, that allows the portable speaker with microphone to take 4-6 hours to fully charge, but plays up to 20 hours of amplify time and up to 13 hours of music playtime