To set Wireless Serial Communication, the HC-05 Bluetooth Module is the most demanding and popular due to its low price and extremely high features. This module can be used in Master or Slave Mode and is easily switchable between these two modes, By default Slave mode is configured. Modes can be changed using AT Commands. The slave mode in HC-05 cannot initiate a connection to another Bluetooth device but can accept connections. The master mode can initiate a connection to other devices.
Features:-
Profiles: Bluetooth serial port Profile
Bluetooth protocol: Bluetooth Specification v2.0+EDR