Altimeter
YesHeart rate
YesGPS
Uses smartphone GPSClock
YesSleep tracking
YesBattery Life
4 daysWaterproof
NoSilent alarm
YesCompanion app platforms
iOS, AndroidWaterproofing
-Altimeter
YesHeart rate
YesGPS
YesClock
YesSleep tracking
YesBattery Life
7 daysWaterproof
NoSilent alarm
YesCompanion app platforms
iOS, Android, WindowsWaterproofing
-Altimeter
NoHeart rate
NoGPS
NoClock
YesSleep tracking
YesBattery Life
-Waterproof
-Silent alarm
-Companion app platforms
Android, iOS, WindowsWaterproofing
Water resistantAltimeter
NoHeart rate
YesGPS
NoClock
NoSleep tracking
YesBattery Life
30 daysWaterproof
YesSilent alarm
YesCompanion app platforms
iOS, AndroidWaterproofing
-Altimeter
NoHeart rate
NoGPS
NoClock
YesSleep tracking
YesBattery Life
6 monthsWaterproof
NoSilent alarm
NoCompanion app platforms
iOS, AndroidWaterproofing
-