How do I determine if a Bluetooth Dongle is good or not?

liquidthex

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I'm looking to buy a USB BlueTooth adapter specifically for data transfer purposes (to/from smart phone), and so I'm looking for one that can provide the highest possible throughput.

When looking at various models I see specifications like
Transmission Power: Class 2
Transmission Power: Class 1
Transmission Power: 4dBm
Radio Frequency: 2.4 ~ 2.4835 GHz ISM Band
Receiving Sensitivity: -90dBm
Sensitivity: Minimum -76dBm

What should I be looking for or avoiding in order to get maximum possible throughput?
 
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