Garmin Forerunner 165

Sleep score and insights
Battery life (Smartwatch mode): Up to 11 days
Daily suggested workouts: Yes (7 days)
Pulse ox oxygen saturation: Yes (spot check, during sleep, all day)
Garmin pay™
Display type: Amoled (optional 'always on' mode)
Touch screen
Water resistance: Swimming, 5 ATM

Strap material: Silicone
Lenses: Chemically tempered glass
Decorative edges: Glass fiber reinforced polymer
Quick release straps: Yes (20mm, industry standard)
Housing size, W x L x H 43 x 43 x 11.6 mm
Fits wrists with a circumference of 126-203 mm
Weight 39g
Screen resolution, W x H 390 x 390 pixels
Color screen
Large font option
Battery life: Smartwatch mode: up to 11 days
Smartwatch mode for energy saving: up to 20 days
GNSS GPS only mode: Up to 19 hours
GNSS all systems mode: up to 17 hours
Charging method: Garmin charger with plug
Memory/history: 4 GB

Time/date
Time synchronization via GPS
Automatic summer time
Alarm clock
Timer
Stopwatch
Sunrise/sunset time

Heart rate monitor on the wrist (constant, every second)
Daily heart rate measurement at rest
Abnormal heart rate alerts: Yes (high and low)
Breathing rhythm (24X7)
Fitness age
Body battery™ energy monitor
Stress measurement throughout the day
Reminders for relaxation
Relaxation breathing timer
Breathing
Sleep: Yes (advanced)
Recording of naps
Hydration: Yes (in Garmin Connect™ and optional Connect IQ™ widget)
Women's Health: Yes (in Garmin Connect™ and optional Connect IQ™ widget)
Health snapshot

For more information, visit the Garmin website:
https://www.garmin.com/nl-NL/p/1055469/pn/010-02863-20#specs
Here are many more specifications about this very extensive luxury watch.