| A - Standby | Short press to put your Beoplay A9 4th Gen in standby. Long press to switch it off. |
| B - Reset/Mic | Short press both buttons A and B to enter Wi-Fi setup mode. When in setup mode, short press both will cancel the setup. In normal mode, short press to mute/unmute microphone. |
| C - Line-in | Optical/analogue mini-jack for connecting external audio sources. |
| D - Ethernet | Ethernet socket for a wired network connection. |
| E - Power | Connect your Beoplay A9 4th Gen to mains supply using only the enclosed mains cable. |
