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 Mixer Material: Aluminium Alloy Color: Black Voltage: DC 5‑15V ( Without Adapter) Input and Output Connector: 3.5mm. Package List: 1 x Stereo Sound Signal Mixer Note: 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.