1.You have one stereophonic signal source (TV audio frequency, player, , mobile phone, PAD, computer, gramophone) to output to other equipment at the same time (example the power amplifier, loudspeaker box or prepose amplifier) 2. This type product to solve that 1 set stereophonic input 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 same with the input.4. Input and output adopt standard RCA interface 5. Simple installation: input and output, to be used once inserted, convenient to install, input and output signal no consumption, then can enjoy different hearing experience Interface: RCA interface Power supply: USB 5V supply power Input and output impedance: 10K - 50K Frequency responding: 20 - 20kHz.Distortion: Less than 0.002% Output consumption: Less than 0.01dB Signal gain: 0dB Signal-noise S: 98dB Input and output interface: standard RCA interface Input passageway: 1 set stereophonic input Output passageway: 4 sets stereophonic output at the same time (4 sets output unified volume adjustment) Material:Metal colour:Black Package Contents: 1 x Audio signal splitter Only the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing.The measurement allowed error is +/- 1-3cm.