Maker hart Just Mixer S Stereo 3-Input/2-Output Ultra-Compact Audio Mixer This is the "Maker hart Just Mixer S" stereo 3-input/2-output ultra-compact audio mixer. It has been used infrequently and is in good condition. It works without any problems. One USB cable is included. Ultra-compact mixer - Compact and simple sound mixer, easy to operate and carry. USB or battery power mode - Can be powered by 5V/1A USB or 1.5V battery (AAA) *2. Battery life is over 15 hours. Stereo 3-input/2-output - You can connect three 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, for karaoke, MP3 players, compact devices, smartphones, Amazon Echo Dot, and in various other places.