Product description2 in 1 out signal selection, switcher, speaker, switcher output, left and right channels, volume balance adjustment, RCA interface, no loss1. 1.No need for power supply design, direct plug and direct use, no loss of input and output signals. Output with left and right channels, independent volume control function2.This product is mainly used to select a common output device for switching various stereo signal input. If there are two stereo signal sources (such as TV audio, MP3 player, CD player, video game, mobile phone, tablet, computer, record player), the device needs to output to the power amplifier or active speaker.3.Two sets of stereo source switchers solve the complex line plugging operation. As long as the required input device signal source is uniformly connected to the switcher, it can be easily selected.4.RCA interface design is used for product input and output standards, and the switch is designed with manual push-button switch of precise 2 positions. Precise volume adjustment of left and right channels. Product parametersPower supply: no power supply, plug in and use directlyMaterial: all metal case designInput and output impedance: 10 k - 50 k Frequency response: 20-20 kHzDistortion: < 0.002%Insertion loss: 98dBInput interface: standard RCA interfaceOutput interface: standard RCA interfaceNumber of input channels: 2 stereo input signal sourcesNumber of output channels: 1 channel stereo outputControl switch: Accurate selection of gear 2, manual switchNet weight: 0.14kgGross weight after packaging: 0.16kgProduct size: length 69mm X width 43mm X height 39mmPackage size: length 83mm X width 73mm X height 51mm Kit list1 X 2 in 1 out signal selection, switcher, speaker, switcher output, left and right channels, volume balance adjustment, RCA interface, no loss