A smartwatch, or smart watch, functions not only as a timekeeper, but also allows users to view calendar appointments, make and receive calls; even view e-mail. Similar to a personal digital assistant, some devices having a mobile operating system installed on them as well as functionality for some mobile apps. A smart watch may also be able to sync with a smartphone or tablet computer, depending on their respective versions of Android or iOS operating system. Some smart watches also include Bluetooth, WiFi, and a GPS. In the picture is an example of a Smartwatch from Samsung.