A "second monitor" refers to an additional display screen that you connect to your computer. It allows you to expand your workspace and have more screen space for multitasking or viewing multiple applications at the same time. Full definition
When you hit the heart rate monitor button you will get a screen with instructions and after 5 seconds the monitoring process will begin, process takes few seconds. (gogi.in)
First monitor showing glance screen, but second monitor doesn't. (microsoft.com)
This device works fine as second monitor as well if we understand what eink is and it's pros and cons. (ereader.store)