A realistic device that simulates the non-local PR box without   communication
  A black box with two input bits and two output bits is called a non-local PR box, if the XOR of the output bits equals the AND of the input bits. In a recent article, Cerf et al. show that Alice and Bob, using such a PR box, can effectively simulate entanglement without the need of communication. We show that an adaptation of a model due to Dirk Aerts, yields a realistic simulation of the non-local PR box without communication. Because the model is entirely realistic, it cannot violate relativistic constraints. Like a non-local box, it can be used to simulate the singlet state coincidence probabilities, but the time to complete the observation of the outcome will exceed the time it takes a photon to travel one arm in an EPRB setup. The model explicitly shows how to produce an outcome that is locally perfectly random, but nevertheless determines what happens in the other wing of the experiment, without communication taking place between the two wings. In this sense, it can serve as an accurate metaphor for the mechanism of entanglement. The model considerably strengthens the claim that no communication is necessary to simulate entanglement. 
Sven Aerts