Feature: 1. STEREO MIXER: Stereo sound mixer mixes 4 stereo sound signals, mixing sound signals from mixed instruments, CD players, tape players, computers, cell phones, tablets to speakers and headphones. 2. RCA INPUT AND OUTPUT: Stereo mixer features 4 channels of RCA input and 1 channel of RCA output for ease of use, which is the best choice for headphones and speakers. 3. 4 SEPARATE VOLUME CONTROLS: Each channel of the sound mixer has its own independent volume control to adjust the volume as needed, making it very convenient to use. 4. ULTRA LOW NOISE: 4 channel line mixer delivers better sound quality even at maximum output electrical frequencies, providing excellent sound performance. 5. EXCELLENT DESIGN: Stereo sound mixer has 3.5mm stereo interface. The shell is made of high quality aluminum alloy, which is sturdy and durable. Specification: Item Type: Mixer Material: Aluminium Alloy Power Supply: DC 5-19V Interface: 1 x 3.5mm/0.1in Stereo Interface, 4 x RCA Interface, 1 x RA Output, 1 x 3.5mm/0.1in Headphone Output Features: 1. When You Have Multiple Sound Devices Need to Share Sound or Amplifier, You Can Connect Multiple Devices at the Same Time, Which Output to Use, Convenient and Practical, No Need to Switch 2. Can Be Connected to Multiple Sound Sources at the Same Time, Do Not Affect Each Other, Can Be Mixed or Output Separately 3. Plus Gain, the RCA Output Port is About 2 Times, the Headphone Port is About 4 Times. Package List: 1 x Amplifier Note: Best to Use a Linear Power Supply, Switching Power Supply is Prone to Humming.