Mini passive stereo mixer is a stereo four-way passive mixer for extended control tuning, mixing instrument, C-D player, tape player, computer, mobile phone, tablet and so on. No battery or other power source required. The device can also be used as 1 In 4 Out stereo distributor clockwise to adjust the volume. OUTPUT: is used to connect RCA jack to mixer output or other output devices. IN 1-4: controls the signal level from input 1-4. 4 groups of stereo RCA input and 1 group of stereo RCA output. Four independently regulated 100K ohmic potentiometers. Item Type: Sound Mixer Model: CX400 Channel: 4 channels Input impedance: 10K ohms to 47K ohms Output impedance: 2.5K ohms to 10K ohms Gain: -12dB MAX HDMI-Compatible version:HDMI-Compatible 1.4a HDMI-Compatible resolution:UP TO 1920x1080/60Hz Support video color format:24bit/deep color 30bit,36bit Max bandwidth:225MHz Max baud rate:2.25Gbps Input/Output TMDS signal:0.5-1.5Volts p-p(TTL) Input/Output DDC signal:5Volts p-p (TTL) Max working current:350mA Operating Temperature range:(-15°C to +55°C) Operating Humidity range:5 to 90%RH (No Condensation) Color: Black Material: Metal Package Contents: 1 x CX400 Audio Mixer