"HDPE, the recyclable plastic used for products such as milk jugs."
I'm pretty sure that the plastic used for milk jugs is LDPE (Low Density Polyethylene), not the high density variety.

"human-like mice".
  Boy, I'd like to see what one of those look like. My mind is racing!

Smart phones may be "better", but they're also about ten times bigger and there are plenty of times you don't carry a phone, but would wear a watch. I used to own a Casio full scientific watch (in the '80s) and used it as such all the time.