Tenealay 3.5 Mm Audio Volume Controller, Line Volume Control Box, 1/8", Mc11. Description: This MC11 box is a mini size line volume controller, you can adjust volume quickly without using the music player any more. Product design is pure volume level control, it is not affects sound quality or color added. (note it has no amplification function) Very conveniently to control volume to get a comfortable listening level. Features: Compatible with many devices and music system: headphones/headsets, MP3 player, smartphone, PC computer, TV, amplifier,active speaker etc which have line out jacks Quality potentiometer and other components. Build in quality aluminium CNC chassis, looks nice and durable. With rubber feet on bottom. Connectors: 1 x 3.5mm (1/8") input 1 x 3.5mm (1/8") output Use instruction: No need power supply. Plug and play. Useful and Quickly to adjust volume level Up and Down 3.5mm 1/8" aux input output jacks It allow you to adjust and control the volume level directly Build in solid aluminium CNC chassis, looks nice and durable. No need power supply. Plug and play.