A technique for performing a random access procedure in a fast moving mobile device in context with accessing a radio base station is described. According to an aspect of the present invention, there is provided a contention-based data communication system in a wireless communication where a plurality of terminals contend to obtain data transmission resources. At least one electrostatic discharge protection circuit or a portion thereof is disposed in at least one of the plurality of rows of the array of the plurality of devices. The ultra-hard material is polycrystalline in nature and is typically PCD or PcBN. The randomly selected identifier is then presented to the human user. The microprocessor, the powder container and the liquid container can be replaced by an exchangeable compressed air tank andor pressurised liquid andor powder containers in different configurations.