HC-06

– Easy wireless serial link for Arduino and microcontrollers
– Bluetooth 2.0 SPP with default 9600 bps
– Up to 10 meter range for short-distance projects
– Compact 27mm x 13mm module; breadboard friendly
– Works with Arduino, Raspberry Pi, STM32 and Android
– Low current draw (30-40mA when connected)
– Simple wiring: VCC, GND, TXD, RXD, State