This product is designed for solving the problem of distributing 1 set of stereophonic input to 4 sets of simultaneous output. You can choose RCA interface or 3.5mm interface according to practical needs. Note: Size and color may be slightly different because of manual measurement and different light conditions. Thanks for understanding. Specifications: Interface: RCA Interface/ 3.5mm Interface (Optional) Color: Black Material: Metal Power Supply: USB 5V Input and Output Impedance: 10K-50K Frequency Response: 20Hz-20KHz Distortion: lt;0.002% Output Loss: lt;0.01dB Signal Gain: 0dB Signal to Noise Ratio (SNR): gt;98dB Input Channel: 1 set of stereophonic input Output Channel: 4 sets of stereophonic output at the same time (4 sets of output unified volume adjustment) USB Cable Length: about 100cm / 3.28ft Item Size: RCA Interface: 95 * 53 * 38mm / 3.74 * 2.09 * 1.50in 3.5mm Interface: 87 * 52 * 22mm / 3.43 * 2.05 * 0.87in Item Weight: 150g / 5.29oz RCA Interface: 210g / 7.41oz 3.5mm Interface: Package Size: 10.9 * 8.6 * 5cm / 4.29 * 3.39 * 1.97in Package Weight: RCA Interface: 240g / 8.47oz 3.5mm Interface: 220g / 7.76oz Package List: 1 * Audio Signal Distributor 1 * USB Cable (100cm) 1 * 3.5mm Male to Male Cable (100cm)