Pick up today, 28/01/23.
Typical Panasonic menu in Italian language. From the settings, it easily changes to Greek by finding the word "Lingua"!
Also, changing the pre-recorded voice message from Italian to Greek is easy and simple.
Detail: in the battery compartment, it is labeled as the model KX-TGA685EX.
Also, the batteries are 550 mAh, so I will replace them soon!
Attached are 2 photos.

Very bad device, prefer the 6821 when I bought it 3 years ago it cost less than 25 euros now it has skyrocketed and if you find it, like the simple one in 6811, which I bought for 20 euros and now it costs between 42 and 95 euros at best, you find its price unacceptable. It has a very loud and clear voice, strong sound and notification both in the base and the handset, while in the simple 6811 it only has it in the handset and it sounds very weak. The sound of the notification, the sound of listening and opening is exactly the same because it caused me some damage, I bought the simple 6811 and connected it to the base of the 6821 which is also an answering machine, it connects very easily and automatically retrieves all the contacts

After about a month of use, I declare myself very satisfied. Nice and loud ringtone, bright screen, quick response of the keys. The menu is slightly old-fashioned, it only has the basics, but it's okay. The answering machine is flawless and the base indicators for the messages are very modern, which you can handle both from the handset and the base keys. It has enough space for incoming messages and for the message that the other person records to listen to. It also has a system that allows you to listen to the messages the answering machine has by calling a specific number from another phone and entering a code that you choose. This way, with my mobile phone, I can listen to the answering machine messages even if I'm far away. The only downside is that all the recordings are in Italian, for example when it tells you the time and date the message arrived on the answering machine. Overall, for its price, it's absolutely okay.

I expected at least the battery life that I was used to from previous Panasonic models. Unfortunately, it needs to be charged every 2-3 days. This is the most significant drawback. Other than that, it has the typical functions and menus of Panasonic. A pleasant addition is the answering machine feature, which, even though it is in Italian (as the default setting), can record your own audio message. It requires some searching because there are no instructions in Greek anywhere. Obviously, it is a model that is not intended for the Greek market. I note that it fully supports Greek characters and menus.

I had bought this wireless from a large chain of stores 4 years ago for 55 euros. It has a menu in Greek. When someone calls, the sound is very loud no matter where you are, even in the garden 20 meters away. It has a menu for call blocking, which is very important so that advertising companies don't bother you. It has fallen down 10 times and hasn't suffered any damage. It has illuminated buttons and a screen when you open it. The only thing that needs to be changed for greater autonomy is the batteries. The ones it has are 500 mAh. I don't think there is anything better than this at the price it has now

(Use in a professional space with 5 rooms).
+ Good range, good sound and volume, clear open listening.
- Moderately user-friendly menu, relatively slow in response

Although an old model, it is value for money with a stable value, which is why it has fluctuations in its price (I bought it for 32€ and bought it again for my mother for 40€, there may still be a small stock because it is relatively old). Satisfactory in all aspects, especially if you find it at a price of up to 35€, buy it blindly if you think you need an answering machine.

The phone comes by default in Italian, but it is very easy in its settings. Just follow the steps in the description.
Also, the initial message of the voicemail is in Italian, which you can easily change from the settings.
The volume is very good both on the phone and on the headset. However, it loses quality in open listening.
In addition to the ability to block numbers, there is also the ability to block everyone with a white list.

Excellent Japanese technology device, but you will need to go to the Greek dealership to get the Greek telephone because the one they provide in the box, if it is the box with "t", is Italian or German, depending on the supplier that each store has from Skroutz. So, you will not have the telephone in Greek, but you can delete the existing messages and put your own from there onwards. The difference is in the colors and models, different capacity and buttons. For example, in the 6811, it had the blue button to reduce noise, while in the 6851, it has a button to show missed calls and the indication of recognition

I knew that it doesn't have a menu in Greek but you understand how to change the language easily. The voicemail is default in Italian and doesn't change. Overall, it's pretty good for the basics

This specific model does not have instructions in Greek or English, and a downside is that I cannot find it online.
You change the menu to Greek according to the image in the description.
However, it seems to cover many functions, has a large screen, illuminated keys, and strong call sound