Features:Brand new and high quality. 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. just plug & play. 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. Size:7cm x 5.8cm - 2.76inch x 2.28inch.