Hc06 Specifications:

1- Module: HC-06 slave
2- Interface: VCC- GND- TXD- RXD(reserve LED status output pin- and MCU can judge the Bluetooth connection state through it)
3- 3.3V LDO
4- Input voltage: 3.6V 6V(never over 7V)
5- Input current: 30mA(unpaired) 10mA(paired)
6- Interface level: 3.3V(you can directly connect a variety of SCM 51- AVR- PIC- 7- ARM- MSP430- etc. 5V microcontroller can also be directly connected without MAX232)
8- Effective distance: 10M(open area)
9- Communication format: 8 data bits / 1 stop bit / without parity.