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It is a class-2 bluetooth module with Serial Port Profile , which can configure as either Master or slave. a Drop-in replacement for wired serial connections, transparent usage. You can use it simply for a serial port replacement to establish connection between HC-05 Specification
How to interface With Microcontroller.
Note 1: This is a single unit only. We recommend the purchase a USB dongle to interface to a computer if you do not already have access to a computer with Bluetooth connectivity.
Note 2: Do not attach this device directly to a PC RS232 Port. You will need an RS232 to TTL converter circuit if you need to attach this to a computer
Note 3: I/O Pins are not 5V Tolerant , use level converter for interfacing with 5V Microcontrollers