Standard: IEEE 802.15.1 (Bluetooth)

Frequency Band: 2.4 GHz ISM band (2.402–2.480 GHz)

Data Rate:

• Classic Bluetooth: Up to 3 Mbps (EDR)
• Bluetooth Low Energy (BLE): 1–2 Mbps (BLE 5.x)

Range:

• Class 1: ~100 m
• Class 2: ~10 m (most common in modules)
• Class 3: ~1 m

Common Module Examples:

• HC-05 / HC-06 (Classic Bluetooth, UART interface)
• NRF52832 / NRF52840 (BLE SoC from Nordic, highly integrated)
• ESP32-WROOM (Dual-mode: BLE + Wi-Fi)
• TI CC256x / CC26xx series

Applications:

• Wireless audio (headsets, speakers)
• IoT sensors and wearables
• Smart home devices
• Healthcare monitoring

Key Features:

• Low power consumption (especially BLE)
• Robust coexistence with other 2.4 GHz systems
• Secure pairing and encryption
• Support for mesh networking (Bluetooth Mesh)