Bluetooth vs. Bluetooth Low Energy: How They Differ & Why It Matters for IoT (2021 Update)

Bluetooth first appeared on a mobile phone in 2000, but it wasn’t until 2004—when Enhanced Data Rate (EDR) was introduced—that the technology gained widespread traction. Since then, Bluetooth has evolved through several revisions, each adding new capabilities. The most transformative update arrived in 2011 with Bluetooth 4.0, also known as Bluetooth Low Energy (LE). Understanding the distinctions between classic Bluetooth and BLE is essential for anyone designing IoT or M2M solutions.

What Exactly Is Bluetooth?

Bluetooth is a short‑range, frequency‑hopping radio technology that operates in the 2.4 GHz ISM band. It transmits data in packets across 79 one‑megahertz channels, allowing devices to communicate without cables. In everyday use, Bluetooth often powers wireless headphones, keyboards, printers, and in‑car hands‑free systems.

Bluetooth in M2M and IoT

Classic Bluetooth was originally engineered for continuous data streams, making it ideal for consumer applications that require high throughput, such as file transfers or audio streaming. However, its higher power consumption can be a drawback for battery‑powered, long‑lived IoT devices. Typical Bluetooth IoT use cases include:

• Wireless headsets and earbuds
• File transfers between smartphones and tablets
• Wireless keyboards and printers
• Hands‑free car kits
• Bluetooth speakers and home audio systems

These devices rely on Bluetooth’s ability to maintain a steady connection and move large amounts of data quickly.

What Is Bluetooth Low Energy (LE)?

Bluetooth LE, introduced in Bluetooth 4.0, was designed to support applications that transmit small packets of data infrequently. By spending most of the time in a low‑power sleep mode, BLE can run on a coin‑cell battery for months or even years. This makes it the preferred choice for wearables, medical sensors, and other IoT devices where power efficiency is paramount.

SEE ALSO: Why Use BLE For Asset Tracking?

BLE in M2M and IoT

While BLE also operates in the 2.4 GHz band, its connection strategy differs dramatically from classic Bluetooth. A BLE link is established only when data is needed, typically lasting just a few milliseconds, and data rates can reach 1 Mbps. Common BLE‑powered devices include:

• Blood pressure monitors and other medical wearables
• Fitness trackers like Fitbit
• Industrial process sensors
• Geofence‑based marketing beacons
• Transit apps that sync with city infrastructure
• Various other IoT solutions

Because BLE prioritizes energy savings, it is often chosen for applications that require long battery life and intermittent data transmission.

Bluetooth 5.0 and the Industrial Revolution

Bluetooth 5.0, released in 2016, expanded the technology’s range, speed, and data capacity, making it more suitable for industrial deployments. In 2020 the Bluetooth Special Interest Group (SIG) launched BLE Audio, enabling a single device to stream audio to multiple receivers simultaneously—a feature that will be valuable for public‑address systems and smart‑home audio networks.

Bluetooth vs. Bluetooth Low Energy – The IoT Takeaway

In short, both classic Bluetooth and BLE serve to connect devices, but they differ in how they balance data throughput and power consumption. Classic Bluetooth excels at high‑volume, continuous data streams, whereas BLE is optimized for low‑power, short‑burst communication.

For businesses evaluating an asset‑tracking platform, choosing the right technology can impact battery life, cost, and scalability. Contact a Link Labs representative to learn how our Xtreme Low Energy (XLE) solutions can deliver the most energy‑efficient and affordable BLE deployment for your needs. Book a demo today!