* New Technology - When the Bluetooth was introduced, there were only a couple of manufacturers who understood its importance and incorporated the technology in their cell phones. Those cell phones were considered "cool gadgets". A typical example of a cool gadget now would be one of those Smartphones or the iPhone or even the iPad. While the Amazon Kindle can be considered a cool gadget, it is arguable.
* Rarity - If you own it and your friends own it and everybody you know own it, it's not really a cool gadget anymore even if it's an iPhone. Think of this - when everyone you knew wandered around with a candy bar cell phone, one of your friends must have owned a gem of a cell phone. Now that would have been a cool gadget.
* Cool Brand Name - Well, this is simplicity itself. Some brand names are cool and some are not. The Barbecue Propane Gauge is a boring name while the Xbox sounds cool.
* Rarity - If you own it and your friends own it and everybody you know own it, it's not really a cool gadget anymore even if it's an iPhone. Think of this - when everyone you knew wandered around with a candy bar cell phone, one of your friends must have owned a gem of a cell phone. Now that would have been a cool gadget.
* Cool Brand Name - Well, this is simplicity itself. Some brand names are cool and some are not. The Barbecue Propane Gauge is a boring name while the Xbox sounds cool.