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As the pin resources of Arduino controller is limited, your project may be not able to use normal LCD shield after connected with a certain quantity of sensors or SD card. However, with this I2C interface module, you will be able to realize data display via only 2 wires. If you already has I2C devices in your project, this LCD module actually cost no more resources at all. It is fantastic for Arduino based project. Specifications: Input Voltage: DC2.5-6V Protocol: IIC (I2C) With backlight Adjustable contrast PCB Board Color: black Weight: 5g Size: 41.5 mm×19 mm×15.3 mm/ 1.63″×0.75″×0.60″ Device Address:0x20~0x27 The device address can be modified by short-circuiting A0/A1/A2. The default address is 0x27. The default address can be detected by the program. Address modification instructions: A0, A1, A2 are all left floating, the device address is 0x27 (0100111) Short circuit A0, device address is 0x26 (0100110) Short circuit A1, device address is 0x25 (0100101) Short circuit A2, device address is 0x23 (0100011) . . . . . . A0, A1, A2 are all short-circuited, the device address is 0x20 (0100000) Wiring instructions: GND: power supply negative VCC: power supply positive SDA: IIC data line SCL: IIC clock line Package inlcuded: 5x IIC series interface modules for LCD 1602