HC-05 module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup.
Serial port Bluetooth module is fully qualified Bluetooth V2.0+EDR (Enhanced Data Rate) 3Mbps Modulation with complete 2.4GHz radio transceiver and baseband. It uses CSR Bluecore 04-External single chip Bluetooth system with CMOS technology and with AFH (Adaptive Frequency Hopping Feature). It has a footprint as small as 12.7mmx27mm.

HARDWARE FEATURES:
•    Typical -80dBm sensitivity
•    Up to +4dBm RF transmit power
•    Low Power 1.8V Operation ,1.8 to 3.6V I/O
•    PIO control
•    UART interface with programmable baud rate
•    With integrated antenna
•    With edge connector