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The holographic model is favored by heroes for it's <s>flashing lights and pretty colors</s> light weight and hero-friendly design.
This device uses a highly sophisticated voice recognition interface with a neural response co-ordination relay system. Unfortunately this means that most of the features aren't used by the average hero who can't spell most of those words anyway.
It has however, been found to be extremely useful when flailing around in a panic, as it occasionally comes into direct contact with an attackers head, and rendering them senseless. This allows the hero to use the inbuilt map to make a hasty exit while the opponent is out cold. For the hero's convenience, all taverns and pubs in the vicinity are shown on screen by default. Other less useful locations such as doctors, towns, temple and guildhall locations are also available if really needed.