The HC-05 is a very cool module which can add two-way (full-duplex) wireless functionality to your projects. You can use this module to communicate between two microcontrollers like Arduino or communicate with any device with Bluetooth functionality like a Phone or Laptop. There are many android applications that are already available which makes this process a lot easier. The module communicates with the help of USART at 9600 baud rate hence it is easy to interface with any microcontroller that supports USART. We can also configure the default values of the module by using the command mode. So if you looking for a Wireless module that could transfer data from your computer or mobile phone to microcontroller or vice versa then this module might be the right choice for you.
HC-05 Bluetooth Module In Pakistan TTL Module (With EN Pin) Breakout is the latest Bluetooth wireless serial Module. This version of the famousBluetooth module uses the HC-05. These modems work as a serial (Receiver/Transmitter) pipe. Any serial stream from 9600 to 115200 bits per second can be passed seamlessly from your source to your destination. This remote unit can be powered from the voltage range of 3.3V up to 6V with easy battery attachments. All the signal pins on this remote unit are 3V-6V tolerant. No level shifting of any kind is necessary.
SPECIFICATION
Power supply: 3.6 V to 6 V connected to the VCC pin
Communication leads work with 3.3 V (tolerate 5 V)
HC-12 HC12 Si4463 433MHZ RF Wireless Serial Module With Antenna 
Arduino & IOT Boards, Bluetooth, Communication Modules, Module
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