Maker hart Just Mixer S Ultra-Compact Audio Mixer This is the "Maker hart Just Mixer S" ultra-compact audio mixer with 3 stereo inputs / 2 outputs (includes box and manual). Thank you. I purchased this on Amazon about 5 years ago and used it once or twice before storing it in the box. All 3 stereo inputs / 2 outputs worked. Please note that the included bag and cable appearance may differ from the current Amazon product. Includes one USB cable and two 3-pole cables. (It seems only one was originally included. The other one was an additional purchase, but I'll include it as it's not needed.) I'll also include the batteries, but please assume they are not usable. The ruler in the photos is not included. Ultra-compact mixer - A compact and simple sound mixer that is easy to operate and carry. USB or Battery Power Mode - Can be powered by 5V / 1A USB or 1.5V batteries (AAA) * 2. Battery life is over 15 hours. 3 stereo inputs / 2 outputs - You can connect 3 audio inputs simultaneously. Output from headphones and speakers. Easy operation - Each track has an independent volume adjustment knob, allowing you to adjust the individual volume of each input channel. Usage - Can be used at home, karaoke, MP3, compact devices, smartphones, Amazon Echo Dot, and various other places.