The Polar M430 does offer a backlight for better readability in low light conditions, but there is no setting to switch the display on non-stop for a specific duration such as 10-15 minutes after training.

However, you can switch on the backlight manually by pressing the LIGHT button. However, this light will only stay on for a short time until it switches off automatically to protect battery life.

There is no integrated function that switches the display on for longer than the standard illumination time.