Features 1.Independent Design: 4 in 1 out RCA stereo mixer is designed with 4 independent isolation, no common ground to prevent interference, clear and clean sound bottom. 2.Amplified Circuit Design: The 4 in 1 out RCA stereo mixer's 4 inputs are designed with an amplified circuit to increase the volume and enhance the listening experience. 3.Multi Use: 4 in 1 out RCA stereo mixer is designed with amplification circuit to increase the volume and enhance the listening experience. 4.Input Port: CD player, player, computer and record player and other sound equipment connected to the RCA double lotus input port. 5.Output Port: 4 in 1 out stereo mixer RCA dual lotus output port connected to headphones, earphones, amplifiers, speakers, etc. 6.Cautions: 4 in 1 out RCA stereo mixer's output port is not allowed to be connected to sound equipment to avoid damage to the playback device. specificationItem Type: 4 in 1 Out RCA Stereo Mixer Material: Aluminium Alloy Voltage: 100-240V Input Signal: 4 Channel Stereo Signal Output Signal: 1 Way Stereo Signal Input Impedance: 47k Output Impedance: 600 Frequency Response: 20Hz-20kHz Signal to Noise Ratio: Greater Than 100db (20Hz-20kHz) Harmonic Distortion: 0.04% Typically PackageList 1 x Mixer 1 x Instruction Manual 1 x Adaptor 1 x Power Cord