Simple Portable Amplifier with Wireless Microphone AK-122 *Modified Microphone sound output confirmed. The battery can no longer be charged, so it has been converted to dry cell operation. AC or battery powered (AA x 8 batteries). *Please remove the batteries when using AC power. The pin microphone unit is powered by a 9V battery. Includes pin & headset microphone. 1 microphone input. *Batteries not included for shipping. This is an old item, so there are scratches and stains. For those who don't mind. Only those who understand are welcome to purchase. Selling to organize equipment.