1. Material: metal 2. Support each channel to adjust the volume independently without interfering with each other. 3. Support stereo mix output 4. Support four in and one out mixing output 5. No battery power required, no external power supply required, easy to carry and used anytime and anywhere 6. The audio mixer cannot be used directly. It requires an audio amplifier to amplify the sound output from the mixer. 7. Size: 12.5x6x3.5cm
