SainSmart Sensor Shield Digital Analog Module V4 for Arduino Duemilanove UNO Mega2560 ATMEL Operating Voltage: 5V DC ;Input Voltage (recommended): 7-12VDC ;Input Voltage (limits): 6-20VDC Buckled Analog Port:Handy, solid connection to 6 Analog inputs with VCC/GND Digital IO port:13 ports prepared to digital modules or servos Analog IO Port:2.54 grid male pin header connections Buckled Communication Port:Selectable between I2C and UART