Specification: Item Type: Stereo Amplifier Material: Aluminum Alloy Product Size: Approx. 90 x 38 x 38mm / 3.5 x 1.5 x 1.5in Features: This volume controller input and output are stereo, usually used to control small signal controls, installed between the sound source and the preamp or between the preamp and the amplifier, strings in the sound loop. Input, output is 3.5mm/0.1in, AUX or RCA jack Package List:1 x Stereo Amplifier Note:Manual measurement, please allow some errors. ★ Stereo Amplifier - This volume controller input and output are stereo, usually used to control small signal controls, installed between the sound source and the preamp or between the preamp and the amplifier, strings in the sound loop. ★ Multi Interface Design - Sound amplifier volume controller has 3.5mm AUX or stereo RCA input and stereo RCA output, the output is raised to the level needed to drive the amplifier or speakers. ★ Noise Reduction & Anti Interference - Compact mini amplifier sound amplifier, shielding electronics from electromagnetic interference and noise suppression. Exquisite appearance, compact all metal design, durable. ★ Plug and Play & Easy to Use - Stereo speaker headphone amplifier, easy to set up, no need to install special software, apps or drivers, a true plug and play sound adapter, volume controller. ★ High Compatibility - The headphone stereo amplifier is compatible with most low volume sound sources such as for iPods, phones, TVs, MP3 players, and portable CD players, computers, video games, and more.