This small size Bluetooth 4.0 TTL transceiver module allows your target device communicate with your iPhone/iPAD, Android 4.3 above devices. It's easy to use and completely encapsulated.You can set it as slave or master. You can use AT command set the baud rate.
STATE -You can connect a external LED to indicate the Bluetooth state. It is same as the state LED on the module.
RXD -Receive data
TXD -Send data
GND -Power ground
VCC -DC power in (3.3V-6VDC)
TTL data transparent transfer between a host Bluetooth device(IOS or Android 4.3).