Features: brand new and high quality 2 in 1 out or 1 in 2 out audio source signal selection, switcher, computer, speaker, audio source, switcher, RCA interface, lossless transmission. No need for power supply design, direct plug and direct use, no loss of input and output signals, switching transmission. 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. 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. 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. Specifications: Material: ABS Color: Black Product Dimension: approx. 39x43x69mm/1.54x1.69x2.72inches Net Weight: 200g/0.44lbs Power supply: no power supply, plug in and use directly Material: all metal for case design Input and output impedance: 10 k Ω - 50 k Ω Frequency response: 20-20 kHz Distortion: < 0.002% Insertion loss: <0.01dB Signal gain: 0dB SNR S/N: >98dB Input interface: standard RCA interface Output interface: standard RCA interface Number of input channels: 2 stereo input signal sources Number of output channels: 1 channel stereo output Control switch: Accurate selection of gear 2, manual switch Package Includes: 1PC 3.5mm Stereo Audio Switcher note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.