To return to the oximeter, it is relatively small and its battery allows at least two or three weeks of daily use. His green display almost "magical" is very legible, even in bright light (same principle as the meter BG5 of the same brand). The pulse-taking is fast, typically less than 5s. No need to have a smartphone for the results, they can stay in memory until the next synchronization.
A wrist strap is supplied with the unit and can be worn easily on itself in case of specific needs.