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What Is the Difference Between Bluetooth 2.0, 3.0, 4.0 and the Revisions?
Brief Description:
When choosing a pair of Bluetooth headphones, you should pay attention to the Bluetooth version as different versions obtain different features and will definitely influence the experience that you feel about the headphones. Below are the differences between Bluetooth 2.0, 3.0, 4.0.
Description
Description
When choosing a pair of Bluetooth headphones, you should pay attention to the Bluetooth version as different versions obtain different features and will definitely influence the experience that you feel about the headphones. Apart from the versions, there are some specific optional features. Below are the differences between Bluetooth 2.0, 3.0, 4.0.
 
Bluetooth 2.x: The most popular variant, especially 2.1. Bluetooth 2.x introduces the optional Enhanced Data Rate (EDR) capability. Devices with basic rate + EDR (optional) have theoretical maximum data rate of 3 Mbps. The 2.1 version makes it easier to pair with devices even from different manufacturers and increases the reliability of the pairing process.
Capabilities - Basic rate + EDR (optional)
 
Bluetooth 3.x: Introduces support for an alternate lower layer, i.e. all applications that are available with Bluetooth radio can also be run over an alternate radio like 802.11. This optional feature is called High Speed (HS), and, as the name suggests intended to improve speed.
Capabilities - Basic rate + EDR (optional) + HS (optional)
 
Bluetooth 4.x: Introduces support for collecting data from devices which generate data at a very low rate. The main intent of this feature, called Low Energy (LE), is to aggregate data from various sensors, like heart rate monitors, thermometers etc. The commercial name of this Low Energy (LE) feature is Bluetooth Smart.
Capabilities - Basic rate + EDR (optional) + HS (optional) + LE (optional)
 
Each revision of Bluetooth improves upon power consumption, data rate, security, pairing reliability, ease and speed, etc. And you should note that most of the features introduced with newer revisions are optional, and it's important to pay attention to the added feature, not only the Bluetooth version. This way you will have the most appropriate and ideal Bluetooth headphones you want.