From the manufacturer

Elevate Wrist Heart Rate Technology
Forerunner 235 with Elevate heart rate technology measures heart rate at the wrist 24/7・ giving you the option to run without a strap. Its colorful gauge identifies your heart rate zone and beats per minute in real time. Stay in the zone and race to your personal best with Elevate wrist heart rate technology.
GPS Running Watch with Wrist-based Heart Rate
Forerunner 235
Stay on pace for your next personal record with Forerunner 235・ the GPS running watch with Elevate wrist heart rate technology and smart features. Includes activity tracking and connected features like automatic uploads to Garmin Connect・ smart notifications and audio prompts・ as well as customizable widgets・ applications and watch faces from the Connect IQ store.

Connect IQ
Connect IQ is also home to custom watch faces・ widgets・ apps and data fields you can download for free.
Key Features
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Smart Notifications Displays email・ call・ text・ social media and other alerts. | VO2 Max Estimate Estimates the maximum volume of oxygen you can use during activity. | Weather Widget You can also use the app¨s wireless connectivity links to receive current weather conditions and forecasts. | Activity Tracking Counts steps・ calories and distance throughout the day・ and the move bar with vibration alert motivates you to move when you¨ve been sitting too long. |
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| Color Display | ? | ? | ? | |
| Advanced Workouts | ? | ? | ? | |
| VO2 max estimate | ? | ? | ? | |
| Recovery Advisor | ? | ? | ? | |
| Step Counter | ? | ? | ? | ? |
| Virtual Pacer | ? | ? | ||
| Sleep Monitoring | ? | ? | ? | ? |
| Pace Alert | ? | ? | ? | |
| Wrist-based heart rate | ? | |||
| Connect IQ | ? | ? | ? |