HC-05 Bluetooth Master Slave Module

Bluetooth communications module mounted on base board for easy plug-in connection and voltage regulation.
Ideal for use in Arduino serial communication projects.
Power: 5Vdc 50mA. Bluetooth protocol: Bluetooth Specification v2.0+EDR
Frequency: 2.4GHz ISM band
Modulation: GFSK(Gaussian Frequency Shift Keying)
Emission power: ≤4dBm, Class 2
Sensitivity: ≤-84dBm at 0.1% BER
Speed: Asynchronous: 2.1Mbps(Max) / 160 kbps, Synchronous: 1Mbps/1Mbps
Security: Authentication and encryption
Profiles: Bluetooth serial port

Follow the datasheet link for an example project.