Description:                                                                                                            
 Compatible with Ard uino UNO, Leonardo, easy access to a variety of Ard uino expansion board
XBee-board interface for easy access to a variety of XBee modules
Onboard USB TO UART, serial facilitate debugging, can also be configured as XBee USB Adapter
Onboard sensor interface, easy access to a variety of sensors
Onboard ADC, 10 bit, 38KSPS, 11 channels (6 channels for Ard uino interface, 5 channel for accessing sensor)
Onboard RTC, which is one of the most commonly used functions                                    

Shipping list:                                                                                                                    
1 x Raspberry Pi 3 A + B + 2 generation B-type expansion board ARPI600