I think the nurse told me it was all plastic and could be recycled with plastics but when I saw her and gave her my first used applicator thing, she put it her sharps bin. But I didn’t think it had a needle? The lid is obviously just plastic so no problem. What about the sensor itself? Does that go with other things with batteries or what? Do I need to use a sharps bin for the applicators? They are rather large, much larger than finger prick needles.