Bluetooth versions and what each added
Bluetooth has evolved from a slow cable-replacement for phones into the backbone of wireless audio and the Internet of Things. This reference lists every core specification version from 1.0 to 5.4 with its maximum data rate, typical range, and the single most important feature it introduced.
How it works
Two technology branches matter. Classic Bluetooth (Basic Rate / Enhanced Data Rate, BR/EDR) is a continuous connection optimised for streaming, peaking at 3 Mbit/s with EDR. Bluetooth Low Energy (BLE), introduced in version 4.0, uses short, infrequent radio bursts to minimise power, trading throughput for battery life measured in months. From 4.0 onward most chips support both stacks, and an application picks whichever fits.
Range and speed are governed by the radio PHY. Bluetooth 5.0 added an optional 2 Mbit/s PHY (faster) and a Coded PHY (longer range, up to ~4x), so the same version can favour either speed or distance. Later 5.x releases focused less on raw speed and more on capability: direction finding for indoor positioning (5.1), LE Audio and the efficient LC3 codec (5.2), power and reliability refinements (5.3), and large-fleet advertising with encryption (5.4).
Tips and notes
- The advertised range assumes the highest power class in open air; in practice walls, human bodies, and the 2.4 GHz band’s congestion cut it sharply.
- LE Audio and Auracast (broadcast audio to unlimited receivers) require Bluetooth 5.2 or later on both ends.
- Higher version numbers do not always mean faster audio; classic BR/EDR still carries most high-quality headphone streams.
- For battery-powered sensors, choose BLE and the longer-interval advertising modes; for low-latency audio, classic or LE Audio with Isochronous Channels is the right fit.