Feature: 1. Mix the Pretty Music: This stereo audio mixer can mix and arrange the input signal and produce pretty melodies, which will better improve playing. 2. 4 Input and 1 Output: With 1 main output volume knob and 4 independent input volume knobs, no interference between the inputs of the four channels. 3. Better Compatibility: The audio mixer can mix signals from CD players, musical instruments, portable recording devices, video playback devices, etc. 4. Great Passive Design: Passive circuit design does not increase or decrease audio signals and can operate without batteries or external power sources. 5. Convenient Carrying: Designed to have a light weight and a compact size, the 4 channel audio mixer is very convenient to carry for indoor and outdoor. Specification: Item Type: Audio Mixer Product Material: Metal. Package List: 1 x Audio Mixer1 x Data Cable1 x Adapter1 x User Manual