Feature: 1. [Extended Control]: The 4 channel line mixer is designed to extend the sound control capabilities of tuning, mixing instruments, playback devices, and electronic devices. 2. [No Power Needed]: The stereo line mixer does not need batteries or external power sources, ensuring convenience and practicality, can simply connect and start mixing right away. 3. [Versatile Functionality]: Not only can the line mixer be used as a stereo mixer, but can also function as a four channel stereo distributor, allows for various applications, catering to your unique sound needs. 4. [Easy Connection]: Equipped with output RCA jacks, the line mixer provides easy connectivity options to connect your mixer with other devices seamlessly, ensuring stable and reliable connections. 5. [Precise Volume Adjustment]: Featuring four independent 100K ohm potentiometers, the line mixer allows for precise control over signal levels, enhancing your overall sound experience. Specification: Item Type: Passive Mixer Material: Iron Size: Approx. 83 x 52 x 38mm / 3.3 x 2 x 1.5in Input Impedance: 10K Ohms to 47K Ohms Output Impedance: 2.5K Ohms to 10K Ohms Gain: - 12dB Maximumax. Package List: 1 x Passive Mixer1 x User Manual