![Amazon.com: UpBright 18V AC/DC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 406358 329509-1300 Model PSM36W-180 330733-0020 DC18V 2A 18.0V 2.0A 18VDC 2000mA Switching Power Supply Charger : Electronics Amazon.com: UpBright 18V AC/DC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 406358 329509-1300 Model PSM36W-180 330733-0020 DC18V 2A 18.0V 2.0A 18VDC 2000mA Switching Power Supply Charger : Electronics](https://m.media-amazon.com/images/W/MEDIAX_792452-T2/images/I/71gs4d7ZgeL.jpg)
Amazon.com: UpBright 18V AC/DC Adapter Compatible with Bose Companion 20 Multimedia Speaker System 406358 329509-1300 Model PSM36W-180 330733-0020 DC18V 2A 18.0V 2.0A 18VDC 2000mA Switching Power Supply Charger : Electronics
![New Bos-Volume Control Companion 20 Volume Control Pod C20 Interface Home Audio Speakers Controller for BOSE Companion20 - AliExpress New Bos-Volume Control Companion 20 Volume Control Pod C20 Interface Home Audio Speakers Controller for BOSE Companion20 - AliExpress](https://ae01.alicdn.com/kf/S60426549b55b4d35a38bab1e90fc534bw.jpg_640x640Q90.jpg_.webp)
New Bos-Volume Control Companion 20 Volume Control Pod C20 Interface Home Audio Speakers Controller for BOSE Companion20 - AliExpress
![Beneath the IO label of the Bose Companion 20, there is an additional circular port above the 'Audio In' port. What would this be? : r/bose Beneath the IO label of the Bose Companion 20, there is an additional circular port above the 'Audio In' port. What would this be? : r/bose](https://i.redd.it/hua8qt40s1k61.jpg)