1: chip production factory, stable and reliable quality
2: Power anti-reverse, reverse power does not work
3: Input voltage 3.6 ~ 6V prohibit more than 7V! !
4: can be installed the common Bluetooth module for various models, such as the HC05, HC06, HC07, BC04 or other pin definitions compatible Bluetooth module
5: pin-outs including TXD, RXD, STATE (if any), KEY (if any) common pin, easy to use
6: Size: 1.52 * 3.57 (cm)

Note: The default connection BC04 hardware settings for slave mode, To modify the software settings need to from 3.3V fly line to PIO4