I think the amount of ewaste is pretty small. My uneducated guess is that it's probably about the same as a musical birthday card. And unlike a singing card that probably gets used a dozen times and thrown away, the Index can be used >10,000 times before it's time to recycle it (assuming it lives up to the specs)

For comparison, check out the rechargable Stream ring. It's bulkier, costs >2x as much (before including subscription... The sub alone costs more than buying an index every 2 years), and needs to be recharged every night. It's sort of in line with Pebbles advantage over other smart watches- doesn't need to sleep on a charger every night

I assume you will use your phone for 20-40 years?