Via Bluetooth you can communicate wirelessly with an Arduino. The HC-05 JY-MCU module has a chip that can be used as master or slave. Thus, the HC-05 module can also be connected to another Bluetooth module (e.g., HC-05 or HC-06).
Please note the PDF for details regarding the technical data.
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26.9 x 13 x 2.2mm
Frequency response :
2.4GHz ISM band
Parts as depicted in the photos.