Specification: Item Type: Mini Active Volume Control Knob Material: Aluminum Alloy Model: M1 Colour: Black Interface Input: 3.5mm / 0.14in Interface Output: 3.5mm / 0.14in Package List: 1 x Mini Active Volume Control Knob [GOOD PRODUCTION] - Made with a metal shell and ALPS rotating shaft, CNC machining process for superior durability and structure. [3.5MM INTERFACE] - Connect tablets, computers, mobile phones, and players with the 3.5mm input. Connect power amplifiers, active speakers, and headphone amplifiers with the 3.5mm output. [HIGH PERFORMANCE] - Linear on-board inductors ensure an exceptional listening experience. Replaceable signal cable, high-end stepper potentiometer, and bottom foam pads guarantee optimal performance. [PLUG AND PLAY] - The mini active volume control knob is easy to use, simply plug and play. It can also be used with mobile phones when connected with an OTG cable. [WIDE APPLICATIONS] - Ideal volume controller for watching videos, playing games, and various events such as weddings, celebrations, conferences, and shows. [GOOD PRODUCTION] - Made with a metal shell and ALPS rotating shaft, CNC machining process for superior durability and structure. [3.5MM INTERFACE] - Connect tablets, computers, mobile phones, and players with the 3.5mm input. Connect power amplifiers, active speakers, and headphone amplifiers with the 3.5mm output. [HIGH PERFORMANCE] - Linear on-board inductors ensure an exceptional listening experience. Replaceable signal cable, high-end stepper potentiometer, and bottom foam pads guarantee optimal performance. [PLUG AND PLAY] - The mini active volume control knob is easy to use, simply plug and play. It can also be used with mobile phones when connected with an OTG cable. [WIDE APPLICATIONS] - Ideal volume controller for watching videos, playing games, and various events such as weddings, celebrations, conferences, and shows.