Earphone shunt all metal 4-way independent volume control can be used by 8 people at the same time     With the metal texture of fine carving and grinding, dust-free painters scratch and rust prevention is a pursuit of high appearance style.     Four channel stereo | earphone amplifier ph-4 all metal compact body, AC12 v300ma power supply and four channel volume independent control. The switching between stereo and mono can insert four 6.35mm earphones and four 3.5mm earphones at the same time, which can meet the needs of up to 8 people.     Four channel volume control is the best combination of headphones. Each channel of signal is finely amplified without interference and crosstalk.     Eight channel stereo output, four 6.35mm stereo output interfaces and four 3.5mm stereo output high-quality gold-plated interfaces effectively avoid poor contact          Input interface: stereo: 3.5mm TRS interface RCA interface     Input impedance: 22K ohm     Maximum input signal level: + 22dB     Output interface: stereo: 1 / 4 TRS interface 3.5mm TRS interface     Output impedance: 16 ohms minimum     Maximum gain: 19dB     SNR: Greater than 98dB     Power supply: AC12V external power adapter     size:12.8 x 7.7 x 3.6cm     Material:Metal     colour:black          Package Contents:     1 * host     1 * EU PLUG          Only the above package content, other products are not included.     Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.