Button A - The smooth top-left button A is the Power button. Press and hold to power on/off the device, single press to put the Karoo into Sleep Mode.
Button B - The textured middle-left side button is for Next, you can navigate menu options or change through ride screens using it
Button C - The textured lower-left side button is for Previous, you can navigate menu options or change through ride screens using it.
Button D - The textured top-right button is the Action button and serves several contextual purposes:
This is a “confirm” button on menus
When you enter Ride Mode, press this button to begin your ride (you can also begin a ride by tapping the green navigation bar at the top, or the green slide-out button that appears when you begin riding)
When you’re riding, press this button to bring up an in-ride menu that lets you pause, add or remove routes, end the ride, and more
Button E - The textured bottom-right button is the Back button on menu screens
You can also use it to exit out of ride mode if you need to change anything before you start riding