1. 84 steps - 83 device (super)
2. 50 steps - 1 device (eh?)
3. An hour's drive - unit 16 (iss clear)
Apart from the battery compartment is obviously a planned obsolescence.
The plastic hooks in the cap and especially the filigree battery compartment are not meant for many changes.
But for random results good enough for me a pedometer 5 EUR.