Item Type: Microphone Audio Power Amplifier <br>Material: Aluminum alloy <br>Power Supply: DC 5V <br>Microphone Interface: 3.5mm <br>Indicator Light: 4 Consecutive flashes when powering on or charging to indicate 4 grids of power, and so on <br>Frequency: 5 Level switching (300HZ-4KHZ, 450HZ-4KHZ, 700HZ-4KHZ, 900HZ-4KHZ, 1KHZ-4KHZ) <br>Battery: 3.7V 250mah 502030 lithium battery<br>1、GAIN SWITCHING: High gain microphone amplifier, about 200 times (45db) when the gain switch is flipped up, and about 600 times (55db) when pressed <br>2、ADJUSTABLE FREQUENCY: Input audio signal through 3.5MM headphone plug, plug and play. With separate frequency controls, recording volume, monitor volume control knobs, you can adjust as needed <br>3、STRONG AND LOSSLESS: Adopt excellent aluminum alloy shell, with mini size and exquisite appearance, black shell makes it more stylish and powerful, stereo switch box with lossless signal, sturdy aluminum alloy shell, strong interference resistant <br>4、SPACE SAVING: Lightweight and easy to carry, which can be placed in any cramped place without taking up your space <br>5、APPLICABLE SCENE: With five frequency switching (300HZ?4KHZ, 450HZ?4KHZ, 700HZ?4KHZ, 900HZ?4KHZ, 1KHZ?4KHZ), you can choose the most suitable frequency to improve the sound quality, very suitable for your karaoke, home theater, sound system<p>1 x Power Amplifier</p><p>1 x Power Cord</p><p>1 x Headphone Cable</p>