Ventisonic&reg; Xbee/Bluetooth/SRS485 RS485/APC220 I/O Sensor Expansion Shield V5.0 For Arduino Support RS485; Support Xbee (Xbee pro); Support Bluetooth; Support APC220; Support SD card read/write Extension of 14 digital IO ports (12 servo interface) and power; 6 analog IO ports and power; 1 digital external power port terminal; Digital-port external power supply and an onboard power supply automatic switching;1 External power input terminal and an input pin; RS485 interface; reset button; xbee/Bluetooh Bee Bluetooth wireless data transmission interface; APC220/Bluetooh V3 Bluetooth wireless data transmission interface; IIC/I2C/TWI interface; 3.3V output port; SD card module interface;