What is the difference between Watch 2 and Watch Lite SE devices?

The integration of a patent-pending clinical-grade fingertip sensor, usually found in medical oximeter devices, is at the core of the high precision in Watch 2. Its inclusion allows for your peace of mind, as it helps you be aware and protect your blood oxygen levels. Watch 2 incorporates all-new hardware to understand further your vascular age, full-body composition analysis, body temperature, and many more parameters.

Does the device have the Smart Alert and Guardian/SOS function?