The buttons and light indicators on the back as well as the type numbers* help you distinguish between the members of the Beoplay/Beosound A9 family:
| Variant | Type number | |
| Beoplay A9 1st Gen |
2925-2929 2938-2939 2942 2944-2953 |
 |
| Beoplay A9 2nd Gen Beoplay A9 3rd Gen |
2890-2896 3034-3038 |
 |
| Beoplay A9 4th Gen | 3063-3075 | |
| Beosound A9 5th Gen** | 3090 |
*Located on a label in the connection panel
** The light indicators are identical to the 4th Gen, but the 5th Gen can be identified by the USB-C socket in the connection panel.
How to find the serial number for my:
