Very good sole that delivers what it promises!

I bought this for my soles workday. Since I'm often out and get in the winter cold feet quickly, I decided for the soles. And what can I say? I have the soles now for 4 years and they still do their job, without incident.
The batteries are quickly supplied with batteries and the soles warm up immediately after turning on. Mostly I use the soles in Level 2 of 3. This is the battery life good 16 hours.
Only criticism: battery batteries are empty after a very short time, so I prefer to always use new batteries. This goes in the long run into the money, but I have always toasty warm feet and that's me then well worth it.
I can highly recommend these soles so! ;)