Abstract: A portable electronic device and method that functions as a user interface to notify and monitor, in particular, and to interact, in general, with the user with regard to events generated depending on an application that may or may not use different external services coming from the application and/or the host system and the coupling and decoupling method of the electronic device of the invention allowing its use in multiple situations. The electronic device may consist of a cover containing one or more data microprocessors, one or more wireless communication modules, one or more color displays, one or more general-purpose sensing components, one or more voltage regulators, one or more voltage boosters, one or more electric batteries, one or more battery charge management circuits, one or more battery sensors, one or more amplifier circuits for one or more actuators, one or more oscillators and connection circuitry.