The MX41s is a stereo, four channel passive mixer for expanding a console mixer, mixing instruments, CD or cassette players, or other signal sources. It requires no batteries or other power source. The unit may also be used as a stereo 1-in 4-out box when all controls are turned completely clockwise. Input Impedance: 10K to 47K Ohms Output Impedance: 2. 5K to 10K Ohms Connectors: 5 ea: 1/4" Tip-Ring-Sleeve jacks Gain: -12 dB MAX Dimensions: 3. 3" x 2. 7" x 1. 4" (w x h x d) Weight: 1 lb.