This is the Bluetooth module HC-06 V1.4 Slave.

Pinouts are VCC, GND, TXD, RXD, STATE, EN, STATE( for LED STATE)
TXD and RXD can accept 3.3 V to 5 V logic level.
Vin Absolute maximum is 7 V.
Default pairing code: 1234
Default baudrate: 9600 bps

Microcontroller can read the voltage of the STATE pin to determine Bluetooth connection status.
Input voltage of 3.6 - 6 V, current consumption at 30 mA while not matching, and about 10 mA once its paired.

Effective distance 10 m, more than 10 m is possible, but not to this distance connection quality of the guarantee.

Package include:
1 x HC-06 bluetooth module
1 x connection cable

Specs: