Powerful Voice Amplifier: It is a professional voice amplifier with 10W output powerful sound which allows about 50 student to hear you. Ensuring crystal-clear sound for your student or audience. Perfect for amplifying your voice and saving your throat. Mini Music Player: This speaker amplifier can work as an MP3 audio player, can be used on computers and mobile phones. The mini teacher voice amplifier can repeat single tune, loop all music and switch songs. Supporting AUX audio input (Mic port can be used as AUX port), can work as a wired speaker. Adjustable Microphone Headset: The microphone headset is lightweight and adjustable.You can adjust the distance between the microphone and mouth with its flexible gooseneck.Comfortable design makes it convenient for your teaching, training, presention and other activies. Long Battery Life: Built-in a rechargeable 2500mAh lithium battery. The long lasting battery life of 8-16 hours ensures that the voice amplifier can keep up with your demands throughout the day, and it takes only 3 to 5 hours to fully charge. Portable Voice Amplifier: Compact size (3 x 3.3 x 0.9 inches) and light weight (0.32 lb). With wired microphone headset and waistband, easy to carry anywhere. Ideal for teachers, tour guide, training, meeting, coaches, yoga fitness and all outdoor or indoor activities.