- Bluetooth v1.0 and v1.0b were the first versions introduced. Devices had problems communicating, and there were security issues preventing devices from remaining anonymous while connected.
- Version 1.1 fixed many of the issues in 1.0 and 1.0b, and became the first functional Bluetooth revision.
- Bluetooth 1.2 introduced major changes in Bluetooth technology. Data transfer rate was increased to 1 Mbit/s and the inclusion of frequency hopping spread spectrum changed radio frequencies to eliminate interference.
- Revision 2.0 has better functionality when pairing multiple devices and lower power consumption. Devices labeled 2.0 + EDR enjoy the benefit of enhanced data transfer rates up to 3Mbit/s.
- Bluetooth 2.1 includes easier connection with fewer steps during the pairing process. It also includes a more enhanced method of reducing power consumption.
- Version 3.0 offers high-speed data transfer rates of 24Mbit/s. It uses the standard 802.15 Bluetooth radio but also includes 802.11 functionality for larger file transfers and improved speed.
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