HiLetgo 2pcs BLE 4.0 Bluetooth Module CC2540 CC2541 AT-09 Serial Wireless Module Compatible HM-10 for Arduino

Product Introduction: 1. Input voltage: 3. 3V/5V only needs a set of power supply. 2. Built in level conversion function: 3. If you use MCU 5. 0V and Bluetooth module communication, 5. 0V power supply port, TX RX logic level 5V. 4. If you use MCU 3. 3V and Bluetooth module communication, 3. 3V power supply port, TX RX logic level 3. 3V 5. RX, Bluetooth module serial receiver and TXD MCU connection. 6. TX, Bluetooth module serial port and RXD MCU connection. 5. GND, ground terminal 6. 3. 3V, power supply side 3. 3V power supply 7. 5V, power supply side 5V power supply Package Include: 2 * CC2540 CC2541 AT-09 Bluetooth 4. 0 BLE Module.