This is a small and portable mixer.If your device has only one microphone or instrument interface, this device can increase the number of expansion interfaces to achieve the purpose of multi-channel input. It has 8-channel input and 1-channel output, and the volume of each channel can be adjusted independently. This device also has another feature: it is equipped with a built-in isolated power supply, which ensures there is no interference when it is used while being charged. It can be connected to a charging adapter or other USB interfaces for power supply, and it can be used with continuous power supply for a long time. Indicator light status: Flashing 4 times continuously indicates that the battery has 4 bars of power, flashing 3 times indicates 3 bars of power, and so on. The light stays on when the battery is fully charged. Input and output: 6.35mm 1/4inch mono interface. Charging: TYPE C interface, DC5V, and it can be charged with a mobile phone charger. Battery capacity: 500mAh. It can be used continuously for more than 10 hours after a single charge. Gain: 0dB/10dB, switched by a push-button switch. Color: black Material: Metal Package Contents: 1 x Mixer 1 x 6.5mm Audio cable 1 x Charging cable