Feature: 1. [Good Production] Volume control knob is small and exquisite, made of metal shell and ALPS rotating shaft, CNC machining process, which has a strong structure. 2. [3.5mm Interface] 3.5mm Input: Connect tablet, computer, mobile phone, player. 3.5mm Output: Connect power amplifier, active speaker, headphone amplifier. 3. [High Performance] Volume controller has linear on board inductors to ensure a good listening experience, Replaceable signal cable; High end stepper potentiometer; Bottom foam pads. 4. [Plug and Play] Mini active volume control knob for speakers is easy to use, plug and play; If you use it with an OTG cable, it can also be used with mobile phones. 5. [Wide Applications] The best volume controller for watching videos, playing games, and even various events, weddings, celebrations, conferences, shows, etc. 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