Pressing and holding the Bottom-Left button for 2 seconds will bring up the Power Menu. Click the Bottom-Right button or tap the "Red Power Off" Icon to turn off your Karoo 2.
After 10 minutes of inactivity, Karoo 2 will display a 15-second countdown before shutting down on its own. This should help preserve battery between rides in case you forget to power off the Karoo 2 after a ride.
You can now power off your Karoo mid-ride and continue
that ride when you turn Karoo 2 back on. See: Ride Restore