Kardena Reviews 

I am very disappointed, Kardena is taking money for a product then washing hands from any responsibility. By buying smartwatch in Europe, I wanted to support EU companies instead of Chinese, bad move – probably.
According to the website, service response time is 24 - 48h. After many e-mails send with support request, I send one more with request of refund, replacement or exchange for different product due faulty product, after three days no response whatsoever.
I tried to contact over the phone, but I've got response only in German from digital assistance! No English whatsoever.
I still have no clue if anyone will be in touch with me or if I going to get my money back. I used to work in Germany and whatever Kardena is doing now is not a German reputation at all.
After long sestions of e-mails exchenges, Smart watch has been returned - no refund, no response whatsoever from Kardena. So far I have no smartwach and no money. Any e-mail which I sent since is marked as not delivered. More than likely all is transferred to spam or bin.
AVOID!!!!

Amazing and responsive customer support. Bought the ring and after a while it was not registering my sleep so the customer support gave lots of advice but after a few emails saying problem was not fixed, they shipped a new one. My review is mostly for the customer support

See address
Grootestraße 84
Bonn.
You will see what is there, and you will be surprised.
Is the smartwatch manufacturer Kardena at this address?
A Kardena smartwatch is an inexpensive product that sells for a lot of money. All measurements are fake.

I made an online order and received the wrong model watch. I have written 4 emails to customer support with no answer. I would not trust this company, there is absolutely NO customer service.

This watch does not measure sleep times correctly. Also, REM sleep is always zero. Also, wake-up times are wrong. I used the watch for several days and it is not accurate in calculating sleep times and quality. Also, two and a half hours of sleep were calculated, and in fact I was awake and not asleep!!! Are there any updates or will it remain like this?