Brand Suckoo 4 Channel 6.35mm TRS or 3.5mm HiFi Audio Mixer Headphone Amplifier Switcher Distributor 2 In 4 Out 2 In 2 Out,Mixer Controller for Cell Phone Computer MP3 Musical Instrument Guitar Player External 4 Port Audio Headphone Stereo Stereo Amplifier Loudspeaker. This 2 in 1 mixer headphone amplifier is very practical, equipped with 6.35mm TRS or 3.5mm HiFi audio jack, can connect or switch or mix 2 inputs at the same time and control the volume level of the 2 sources amplification gain function. Distribute 2 audio amplification input signals to 4 external outputs, allowing 4 people to listen to the same audio source or mix at the same time, and the external 4 port headphones can also be used to control the volume level and gain individually. Inputs: 2 way 6.35 mm TRS or 3.5 mm instruments, guitars, microphones, cell phones, computers, MP3 players, switchable inputs or mixing of 2 way input audio. External: 4 way 6.35mm or 3.5mm audio for headphones, amplifiers, speakers and other devices. Color: Black, Product Size: 14.1x6.3x3.1 cm: 1 piece of this product + 6 PCS 6.35 female to 3.5 male adapter + 1 free DC adapter. This mixer also comes with 1 free DC adapter, the external 4 channel headphone distribution can control the volume level gain individually, you can adjust the 2 inputs switching or mixing as needed, and control the volume level and gain of the 2 inputs independently to meet the needs of different users. This is very useful for music production, studio performances or multi person movie viewing. Overall, this Mixer Headphone Amplifier Switcher Distributor 2 In 4 Out is a powerful, convenient and practical audio device, which can help you realize the mixing switching distribution of audio signals and volume adjustment amplification gain.