OnePlus OP7T - Oneplus Switch

 Pause: Tap to pause a countdown.
 Label: Tap the word Label on top of the
countdown timer, input whatever you want to
rename it.
Stopwatch
Start: Tap to start the timer.
Pause: Tap to pause the timer.
Mark: Tap to mark.
Share: Tap to share the timer.
OnePlus Switch
"OnePlus Switch" allows you to quickly migrate
contacts, call logs, text messages, pictures, audio,
video, notes, apps, downloads, documents, and
other data from your previous phone to your
new phone. OnePlus Switch also provides local
backup and recovery.
Use OnePlus Switch to migrate your
data
Use OnePlus Switch to quickly migrate data
from an older phone to your new OnePlus
phone.
Refer to "Transfer data to OnePlus 7T" for more
details.