1、48V phantom power supply for the signal condenser microphone, stable and reliable. 2、Built-in low pass filter circuit design can filter out interference noise; stable voltage doubler-rectifier can effectively filter out the signal interference. 3、With the balanced XLR input \u0026 output jacks to connect in-line with your mic and mixer. 4、USB-powered operation, compact size and full metal shell, portable and durable. 5、With on-off switch and LED indicator for easy and safe operation. Features: 48V phantom power supply for the signal condenser microphone, stable and reliable. Built-in low pass filter circuit design can filter out interference noise; stable voltage doubler-rectifier can effectively filter out the signal interference. With the balanced XLR input & output jacks to connect in-line with your condenser mic and mixer. USB-powered operation, compact size and full metal shell, portable and durable. With on-off switch and LED indicator for easy and safe operation. Specifications: Color: silver Material: metal Power Supply: DC 48V Item Size: 9.6 * 8.8 * 4.8cm/ 3.78 * 3.46 * 1.89in Item Weight: 217g / 7.65oz Package Size:  18.2 * 12 * 7.2cm / 7.17 * 4.72 * 2.83in Package Weight: 342g / 12.06oz Note: The microphone, mixer and connection cable showed in the pictures are not included. Phantom power does not enhance the microphone sound quality and improve its volume. Package List: 1 * phantom power 1 * USB cable 1 * phantom power 1 * USB cable