4duino sensor extended edition V4 Description Each functional module has buckled port with VCC, GND and Output, which has corresponding port on the Sensor Shield, connected with a plain 2.54mm dual-female cable you may start playing already. Buckled brick cables are like cement for bricks, make the connections easier, secure and more professional looking. Sensor Shield V4.0 allows you to connect to various modules like sensors, servos, relays, buttons, potentiometers.just plug &amp play! Each functional module has buckled port with VCC, GND and Output, which has corresponding port on the Sensor Shield, connected with a plain 2.54mm dual-female cable you may start playing already. Buckled brick cables are like cement for bricks, make the connections easier, secure and more professional looking. Operating Voltage: 5VDC 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 Compatible with: Arduino Duemilanove UNO Mega2560 ATMEL Specification: just plug &amp play Operating Voltage: 5VDC Input Voltage (recommended): 7-12VDC Input Voltage (limits): 6-20VDC Buckled Analog Port : 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. Size:7cm x 5.8cm (2.76inch x 2.28inch)