1. You have one stereophonic signal source (TV audio frequency, player, , mobile phone, PAD, computer, gramophone) want to output to other equipment at the time (example the amplifier, loudspeaker box or prepose amplifier) 2. This type product able to solve 1 set stereophonic input able to distribute output 4 sets stereophonic, 3. Output has volume adjustment function, output without sound amplify function, the output keep the original tone quality and volume with the input. 4. Input and output adopt standard RCA interface 5. Simple installation: input and output, able to be used once inserted, convenient to install, input and output signal no consumption, then can enjoy different hearing experience Interface: RCA interface supply: USB 5V supply Input and output impedance: 10KΩ - 50KΩ Frequency responding: 20 - 20kHz. Distortion: Less than 0.002% Output consumption: Less than 0.01dB Signal gain: 0dB Signal-noise S: Greater than 98dB Input and output interface: standard RCA interface Input passageway: 1 set stereophonic input Output passageway: 4 sets stereophonic output at the time (4 sets output unified volume adjustment) Material:Metal colour:Black Package Contents: 1 x Audio signal splitter Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.