Smart watches have been in existence for around three decades.
Early versions of smart watches allowed a user to feed data, view different time zones, and perform basic calculation. The next generation of these devices incorporated GPS and a host of other wireless sensor features, including thermometer, compass, altimeter, barometer, camera and accelerometer. Several combinations of these features were developed to attract a specific set of consumers

https://accessories.com.ng/40-best-android-smartwatch-on-jumia-with-price/