hc-05 bluetooth module price.

Input voltage : 3.3V to 6V (Avoid > 6V DC)
Core module size : 28 mm x 15 mm x 2.35 mm
Default Baud Rate : 9600
Security:  Authentication and encryption
Speed : Asynchronous –  2.1 Mbps (Max) / 160 kbps, Synchronous – 1 Mbps
Bluetooth Protocol :  Bluetooth Specification v 2.0+EDR
Mode Supported : Master & Slave
Frequency :  2.4 GHz ISM band
Module works well with both 3.3V and 5V Arduino Boards, Default Pin : 1234