The Pyle PWMA80UFM is a 100-watt, rechargeable portable USB/SD-equipped PA with headset lavalier microphone. The small, super-powerful voice amplifier is perfect for teachers, coaches, tour guides and presenters - you can be heard up to half a mile away. The built-in rechargeable batteries last up to 8 hours. Headset microphone keeps your hands free. Listen to your digital music files via the USB port or SD card slot, or hook up any digital music player using the auxiliary input. Connect the PWMA80UFM to a more powerful speaker using the 3.5 mm output jack.