A smart watch is a wearable computer, usually electronic, with a display and a battery life long enough to display text messages and make calls. The device sends messages to the user's smartphone, and also to other devices connected to the smartphone, by displaying them on the watch screen. It can also make calls and send SMS messages.

The most popular models of smart watches are those that connect to the user's smartphone by means of a Bluetooth or other wireless connection. In addition, some models can also connect to other devices by means of a USB or other connection.

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