1.Brand 8 Channel 6.35mm TRS or 3.5mm HiFi Audio Mixer Headphone Amplifier 1 In 8 Out 1 In 6 Out Mixer Controller for Cell Phones Computers MP3 Musical Instruments Guitar Players External 8 Port Audio Headphones Stereo Sound Speakers. 2.This 2 in 1 audio headphone amplifier is very practical, equipped with 6.35mm TRS or 3.5mm HiFi audio jack to connect or control up to 8 headphones at the same time, with volume level and amplification gain function. A single audio input signal can be distributed to 8 external headphone outputs, allowing up to 8 people to listen to the same source at the same time with individual control of volume level and gain. 3.Input: 1 way 6.35 mm TRS or 3.5 mm instruments, guitars, microphones, cell phones, computers, MP3 players. External: 8 way 6.35mm or 3.5mm audio headphone amplifier speakers or other devices. Color: Black, Product Size: 19.6x5.7x3.1 cm: 1pc of this product + 9PCS 6.35 male to 3.5 female adapter + 1pc DC adapter for . 4.In addition, this headphone amplifier also comes with a DC adapter, external 8 channel headphone volume control amplification function, you can adjust the volume level and gain of each output channel as needed to meet the needs of different users. This is very useful for music production, recording studio, performance or multi person movie viewing scenarios.