1、FOUR OUTPUTS: Stereo sound signal mixer supports two inputs and four outputs, allowing four headphones or external amplifiers to be pushed directly into each other without interfering. 2、OUTPUT LEVEL CONTROL: Each channel has an output level control, and each listener can use the dedicated output level control to determine their own preferred volume level. 3、MULTI APPLICABLE OBJECTS: If you track multiple musicians at the same time, or if everyone in a group wants to listen to a playback, you need a monitor distribution system. 4、POWER SUPPLY: Headphone amplifier mixer is small and flexible enough to power almost any headphone, and can power up to four pairs of headphones and up to four separate volumes. 5、SUITABLE FOR: Stereo sound amp mixer features a durable and compact design headphone amplifier that is perfect for stage and studio performances or applications that require multiple headphone connections. Item Type: Stereo Sound Signal Mixer Material: Aluminium Alloy Color: Black Voltage: DC 5‑15V ( Without Adapter) Input and Output Connector: 3.5mm 1 x Stereo Sound Signal Mixer Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.