The boAt Crest app allows you to link your smart watches with your Android phone.
The applicable watches are:
MERCURY
VERTEX

Heart Rate Monitoring
24/7 monitoring of your heart rate providing you insights on your vitals.

Auto Temperature Monitoring
With an in-built temperature monitor keep track of your temperature anytime anywhere.
This feature is applicable if supported by your smart watch.

SpO2 measurement
Measure your SpO2 levels from the watch

Sleep Tracking
Sleep duration and quality tracked automatically

Fitness and Activity Tracking
Track your Steps Distance and Calories burnt along with support for multiple activities like Running Cycling Walking Yoga and many more

Watch faces
Choose from a variety of watch faces depending on your style

Fitness Rank & Badges
Earn badges as you keep fit and monitor how you stack up against others

Fitness Buddies
Share your fitness progress with your friends & loved ones

Phone Finder
Find your phone with the Phone Finder feature

Alerts
Receive Sedentary reminders and alerts for Calls SMS and Social messages

Note: This app uses the READ_CALL_LOG permission to enable call notification feature on your MERCURY/VERTEX smart watch.