Samsung watch 4 SM-R865F Sports & GPS Smart Watch

Secondhand in a good condition
Size: S/M
Track your fitness progress.
Track your activities and fitness scores on your watch and phone
The sleep tracker detects and holistically analyzes your sleep stages while you rest. Improved measuring options let you check your blood oxygen levels and snoring patterns (not saying you do). Plus, get advanced insights from the National Sleep Foundation for better sleep quality and duration.