What is Bluetooth?
Bluetooth is a wireless communication standard designed for short-range connections – typically up to about 10 meters (33 feet). It’s the technology that lets your wireless earphones talk to your phone, your keyboard talk to your laptop, and your smartwatch talk to just about everything.
First standardized in 1998, Bluetooth has gone through numerous versions, each improving speed, range, power efficiency, and audio quality. Today it’s so ubiquitous that it’s hard to find a consumer gadget that doesn’t support it. Understanding the version numbers and key features helps you make smarter buying decisions.
In-Depth
Bluetooth Versions at a Glance
| Version | Key Improvements |
|---|---|
| 4.2 | Better data transfer efficiency, improved security. Still found in older IoT devices |
| 5.0 | 2x speed, 4x range over 4.2. Major stability upgrade. The current baseline for earphones |
| 5.2 | Introduces LE Audio – a new low-energy audio standard with lower latency and better quality |
| 5.3 | Further power-efficiency gains and connection stability improvements |
| 5.4 | Adds PAwR (Periodic Advertising with Responses) for IoT applications like electronic shelf labels |
Most wireless earphones sold today ship with Bluetooth 5.0 through 5.3. If you’re buying new, aim for 5.0 at minimum.
Classic Bluetooth vs. BLE (Bluetooth Low Energy)
Bluetooth actually encompasses two distinct radio modes:
- Classic Bluetooth handles larger data streams like music playback. When you’re listening to audio through earphones, Classic Bluetooth is doing the heavy lifting.
- BLE (Bluetooth Low Energy) is optimized for tiny, infrequent data packets – think heart-rate monitors, smart home sensors, and fitness trackers. It sips power but can’t handle high-bandwidth audio on its own.
LE Audio, introduced with Bluetooth 5.2, bridges this gap. It brings audio streaming capabilities to the low-energy side, promising better battery life and improved sound quality simultaneously. It also enables broadcast audio (sharing music with multiple listeners) and hearing-aid support.
Pairing and Multi-Device Connections
To use Bluetooth, your devices need to “pair” – a one-time handshake that creates a trusted connection. After that, they reconnect automatically. Standard Bluetooth connects one-to-one, but multipoint connection lets compatible earphones stay connected to two (or sometimes three) devices simultaneously, switching audio seamlessly between them.
Codecs: Where Sound Quality Lives
Bluetooth itself is just the transport layer. The codec – the algorithm that compresses and decompresses audio data – determines actual sound quality. Common codecs include:
- SBC: The mandatory baseline. Functional but not impressive.
- AAC: Apple’s preferred codec. Good quality, widely supported.
- aptX / aptX Adaptive: Qualcomm’s codecs, popular on Android devices. aptX Adaptive adjusts bitrate dynamically.
- LDAC: Sony’s high-bitrate codec (up to 990 kbps). The closest Bluetooth gets to Hi-Res audio quality.
- LC3 (LE Audio): The next-generation codec for LE Audio. Better quality at lower bitrates than SBC.
Both the sending device (phone) and receiving device (earphones) must support the same codec. The connection defaults to the highest mutually supported option.
How to Choose
1. Version 5.0 or Higher
Don’t settle for anything below Bluetooth 5.0 in a new purchase. The jump from 4.x to 5.0 brought substantial improvements in connection stability, speed, and power consumption. Version 5.2 or above adds LE Audio readiness, which is a nice future-proofing bonus.
2. Check Both Sides of the Connection
Bluetooth performance is limited by the weakest link. If your earphones support Bluetooth 5.3 but your phone only has 4.2, you’ll get 4.2 performance. Before upgrading your earphones, check what your phone (or laptop) actually supports.
3. Low Latency for Video and Gaming
If you watch a lot of video or play mobile games, audio-video sync matters. Look for earphones with low latency mode, aptX Adaptive, or LE Audio support to minimize the delay between what you see and what you hear.
Recommended Products
JBL Charge 6
Our Top Pick.
JBL Flip 6
Most Popular Portable Pick.
Marshall Emberton III
Best Design and Sound Character.
The Bottom Line
Bluetooth is the foundation of wireless audio. The version number affects connection reliability, battery life, and future codec support, so it’s worth checking before you buy. Aim for 5.0 or newer, verify codec compatibility with your phone, and you’ll have a solid wireless experience.