Features 1.[4 In 1 Out] Stereo mixer that mixes four sound inputs into one stereo output. Each potentiometer controls the volume of each channel separately and does not affect each other. 2.[Easy To Control] Stereo sound mixer shell is made of premium metal, sturdy and decent switching device. With the bass and treble controls, you can adjust the settings as needed. 3.[Long Range] 4 in 1 out mixer, direct drive for headphones or connection to amplifier, with 3.5mm stereo socket. With 3.5mm sound cable, providing long range transmission of inputs and outputs. 4.[Compatible Devices] 3.5mm stereo mixer input interface compatible with PC, cell phones, laptops, etc. Output compatible with speakers, headphones, bar speakers and more devices. 5.[Stable] Working voltage is DC 5V?12V, DC5.5 x 2.1, amplification is about 2x. About 8ma quiescent current, using for NJM3414 low voltage high current op amp. Maximum drive current 70ma, easily drive headphones and external amplifiers. specificationItem Type: Stereo Mixer_x000D_ Material: Iron_x000D_ Color: Black_x000D_ Operating Voltage: DC 5V-12V_x000D_ Features:_x000D_ Can directly drive headphones or connect to amplifier, the interface is 3.5mm stereo socket. PackageList1 xStereoMixer 1 x3.5mm Sound Cable