When your voice is not loud enough, you can amplify your voice and protect your throat. Provides 30 watts of clear and soft sound. This microphone and speaker set is a portable public address system. You can take it to multiple locations, such as classrooms, bingo games, and outdoor activities. You can enjoy the functions of our multi-function voice amplifier for hours because it is equipped with a powerful 2200mAh rechargeable lithium battery. The microphone amplifier supports MP3 audio playback, TF (Micro SD) card playback and USB flash memory driver playback. You can repeat a single song, loop all the music and switch songs. The portable speaker microphone provides a sound system for conferences, teaching, training, weddings, yoga classrooms and other outdoor activities, and even for tour guides, elders and whispers. Product parameters: Battery capacity: 2200mAh Fully charged time: 3-5 hours Standby time: 72 hours Size: 9.2*8.4*2.8 Weight: 210g Material: Rubber spray paint+ABS