【Dual Wireless Microphones】 This voice amplifier comes with two wireless microphones. For solo use, you can freely switch between them for long battery life. When used by two people, the speaker can simultaneously receive sound from both microphones. No pairing is required, just power them on and use immediately. Each microphone has only a power button and a mute button for straightforward use 【Five Modes】 (1) Wireless Mode: Connect the amplifier wirelessly to your phone/tablet to use it as a speaker. (2) Amplifier Mode: Connect the microphone for voice amplification. (3) USB Flash Drive Mode: Insert a USB drive to play audio files as a media player. (4) PC Mode: Connect to a PC via USB. (5) AUX Mode: Connect to external devices via 3.5mm AUX input 【Background Music Feature】 In Wireless, USB, PC, and AUX modes, background music is supported—offering a more playful and creative audio output 【Clear Audio Quality】 Equipped with a built in DSP noise reduction chip, it delivers clear sound with high fidelity, low distortion, low latency, and minimal noise even in noisy environments. The output is loud and clear, portable and suitable wireless microphone with speaker for professional teaching, public speaking, training, meetings, tour guiding, promotions, teacher outdoors, and more. Note: Do not point the microphone directly at the amplifier 【Long Battery & Extended Range】 The amplifier’s 2200mAh rechargeable battery fully charges in 3.5 hours and lasts up to 10 hours. Each wireless microphone with battery levels has a 70mAh battery, charges in 2 hours and lasts 8 hours. Enjoy 49ft/15m wireless transmission, ideal for classrooms. Frequency response: 80Hz-18kHz (amplifier); 100Hz-18KHz (microphone). NOTE: For optimal battery longevity, please fully charge the device before first use