In the reactive approach, system components are not supposed to execute at their own rate, but are instead driven by a logical common clock, defining global instants. The Reactive Object Model introduced in this paper, is an object based formalism matching the reactive paradigm. In this model, methods can be invoked using instantaneous non-blocking send orders, which are immediately processed (that is, processed during the current instant); moreover, a method cannot execute more than once at each instant. The Reactive Object Model is described and compared to the Actor Model; then a prototype language based on this model is introduced; finally its expressive power is shown on the example of a broadcast communication mechanism.