Features Good Anti-interference: This is a stereo switch box, the signal is lossless, the sturdy aluminum alloy shell, the anti-interference ability is strong, and the use effect is good. Small and Portable: The mini stereo audio preamplifier is manufactured with professional craftsmanship, exquisite workmanship, small size, easy to carry and easy to use. RCA Jacks: The input and output of the audio fader are stereo, usually used to control small signal controls, installed between the audio source and the preamp or between the preamp and the amplifier, strings in the audio loop. Outputs are 3.5mm or RCA jacks. Compatibility: This stereo audio switcher is suitable for DVD, CD, set-top box, MP3, TV, mobile phone, computer, tablet, turntable, sound card, guitar, bass, electronic musical instrument, game console or other devices. Balanced Sound: RCA stereo audio switcher can increase treble and bass at low volume according to human hearing characteristics, making the sound range wider and better. Specification: Item Type: Mini Stereo Audio Preamplifier Input: 3.5mm Output: 3.5mm Size(LxWxH): Approx. 88 x 38 x 38.5mm / 3.46 x 1.5 x 1.52in Package List: 1 x Mini Stereo Audio Preamplifier Package List 1 x Mini Stereo Audio Volume Controller