FR4 Bluetooth Sensor Expansion Board Module - Red + Blue + Black
Great for people loving making electronics; 14-IO ports (12 servo ports) and power port; 6-analog IO port; One digital port; Can be shifted between digital external power port and on-board power; With one external power input socket and one input pin; RS485 port (D0-RX D1-TX D2-EN); With reset button; xbee / Bluetooth Bee bluetooth wireless data port; APC220 / Bluetooh V3 port; IIC / I2C / TWI output port; 3.3V ouput port; SD card module port. A product for Arduino that works with official Arduino boards.