The Vatican launched an official "eRosary":
It pairs with an app, and is activated when the user makes the sign of the cross:
When activated, the user has the possibility to choose either to pray the standard rosary, a contemplative Rosary and different kinds of thematic rosaries that will be updated every year. Once the prayer begins, the smart rosary shows the user's progress throughout the different mysteries and keeps track of each rosary completed.
When I hear electronic cross, I think of Dan Simmons's Hyperion series, and am not enthused to hear the eRosary "records and provides your health data, so you are encouraged to have a better lifestyle."
Available for preorder in Italy for around $110.