Features: Includes 4high-power stereo amplifiers to maintain maximum sound quality even at maximum volume. Connect the power adapter with the 5Vinterface. When the power connector is connected to the power supply, your mixer will automatically switch on and the power indicator will come on. Unplug the mixer when you need to separate it from the power supply. Note: make sure the power plug is easily accessible when you put the mixer into operation. Specifications: Material:Metal Color:Black,White,(Optional) Power:USB 5V/2A Channel: 4 channels Note: Please allow 1-2cm errors due to manual measurement,pls make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Audio Mixer 1x Cable