Bluetooth module HC-05 (2.0 + EDR)

Waveshare BLE4.0 Bluetooth 2.4G Mother Board, provides I/O expansion connectors and various interfaces. BLE400

Advanced wireless communication module, based on the Bluetooth 5.4 stack (Bluetooth® Low Energy, BLE), which was designed using the efficient Nordic NRF52805 SOC system. The module offers support for the UART interface, available only in peripheral mode, which allows for effective operation as a data bridge (Data Bridge). Sparkfun WRL-25466

Board with the Artemis chip, the GNSS ZOE-M8Q module and the Iridium 9603N satellite receiver. It allows you to send and receive short messages with data anywhere in the world. SparkFun WRL-18712

Bluetooth module v2.0 + EDR, controlled by AT + commands with built-in antenna.

Communication module with the SIM800C system designed for Raspberry Pi minicomputers. Adds support for GSM/GPRS networks. Waveshare SIM800C GSM/GPRS HAT

DFRobot BLE4.1 Module is a Bluetooth 4.1 module with DA14681 processor with 3.3 V power supply. It is characterized by low energy consumption and advanced energy management system (built-in charging module). DFRobot TEL0120

BLE4.0 Bluetooth 2.4G Wireless Module, nRF51822 Onboard. Core51822

Crowtail – Bluetooth-compatible Low Energy Module is a small BLE + EDR communication module intended for wireless data transmission in IoT and automation projects. It enables fast serial-interface connection with mobile devices or computers.

Evaluation Kit with Bluetooth 5.0 BT401. It is equipped with a microSD slot, microUSB connector and two audio outputs. DFRobot DFR0782

Bluetooth 4.0 module based on the CSR8635 chip designed for Bluetooth audio applications. The module has a built-in antenna and pins for edge connectors.

Bluetooth audio receiver module enclosed in a housing that enables wireless transmission of sounds. It is equipped with a PCB antenna and a 3.5 mm audio jack

A compact development board that uses the ESP32-PICO-MINI chip. It provides wireless communication via Bluetooth and serves as an easy-to-configure UART converter. It has a built-in PCB antenna. SparkFun WRL-23287

BLE module based on Cortex-M4F core with integrated 2.4GHz antenna. It has been equipped with numerous peripheral systems, including UART, I2C, SPI, I2S interfaces and ADC inputs. Has support in the Arduino IDE. SparkFun WRL-15484

Integrated circuit, combining Wi-Fi functionality and Bluetooth 4.2 BLE. Integrated 32-bit dual-core Xtensa LX6 processor, 448kB ROM, 520kB SRAM. ESP32 allows you to work with many interfaces, including SPI, I2C, UART, CAN, ETH, IR and can be supplied with 2.2V-3.6V. The system has a QFN48 (5x5mm) housing. ESP32-D0WD

A compact development board that uses the ESP32-PICO-MINI chip. It provides wireless communication via Bluetooth and serves as an easy-to-configure UART converter. It has a built-in PCB antenna. SparkFun WRL-24113

Low Energy Bluetooth adapter module with 2x4 pin 2.54mm connector, extra / high. RS232 allows communication with BLE devices