HC-06 Wireless Serial 4 Pin Bluetooth RF Transceiver Module RS232 TTL, It Allows your device to both send or receive the TTL data via Bluetooth technology without connecting a serial cable to your computer. Works with any USB Bluetooth adapters
Default Baud Rate: 9600, 8, 1, n.
Built in antenna
Operating voltage: 3.3V
Input voltage: 3.3~6V