Questions about BackBeat FIT

Is this headset compatible with the iPod Nano (Bluetooth 4.0)?

When do you think these top headphones will be available again? Unfortunately, my "old" one has succumbed to old age after more than 10 years. Thank you for your feedback.

Hello, Do you have this product in another colour? Preferably all black? Thank you in advance.

My new backbeat has worked exactly once and after recharging it doesn't make a sound. I guess I'll have to take advantage of the warranty period. I am disappointed because the recommendations on the internet were very positive.

Are the Plantronics BACKBEAT FIT 3100 also being considered?

I've been using the headphones for almost a year now and I'm having strange effects with the battery life. At first, the headphones lit up blue, but the battery was still only charged to 90% (according to the display in the settings on the mobile phone). Now, when charging for a longer period of time, it shows 100% again, but after a maximum of 6 hours it stops. This happened to me this weekend during 2 runs on Saturday and Sunday.

Why do the different coloured models cost different amounts? Why, for example, does the "grey" model cost 20 francs more than the "black ..." model? They are completely identical in construction

Is the protective cover that covers the speakers and goes in the ear available separately? If not, will I get a new Plantronics BackBeat Fit as I am still under warranty?

I ordered the product about 8 months ago and used it regularly until autumn. Was very satisfied. But now that I have taken it out again and charged it, it no longer works. It initially lit up red when charging. After a few hours I removed it from the charger. I can no longer switch it on. When I plug it back into the charger, nothing lights up. What can I do?

I got the thing today and charged it up, it lit up red when I plugged it in, I thought it must be like that. After 3 hours I wanted to switch it on but it didn't make a sound. Must be broken?