Description: Each input and output channel of the audio mixer has its own volume control, allowing you to control the volume level of each source. The audio mixer requires no external power supply and is plug-and-play. Designed with 4 channel 3.5mm inputs and 1 channel 3.5mm output, this audio mixer is capable of mixing the signals from compact disc players, instruments, portable recording devices, video playback devices and so on. Using high quality metal material, this product is firm and durable to use. The length of this product is 8.35cm, the width is 5.4cm and the height is 2.1cm. Even at maximum output levels, 3.5mm stereo mixer can maintains exceptional performance and highest sound quality. A great audio adjustment device. Item Name: Sound Mixer Material: Metal Input Impedance: 10K Ohm To 47K Ohm Output Impedance: 2.5K Ohms To 10K Ohms Maximum Gain: 12dB Features: Multi-Channels, Volume Control, Low Noise Size Details: L: 8.35cm/3.29", W: 5.4cm/2.13", H: 2.1cm/0.83" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Sound Mixer 1 x User Manual