Feature: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.Specification:Item Type: Stereo Sound Signal MixerMaterial: Aluminium AlloyColor: BlackVoltage: DC 515V ( Without Adapter)Input and Output Connector: 3.5mm.Package List:1 x Stereo Sound Signal MixerNote:Compatible with 3.5MM headphones and 6.35MM headphones(You need a 3.5MM to 6.35MM adapter)Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.