Using this 7 segment LED Keypad Shield is a breeze. First, make sure it's connected properly to your Arduino as it's Arduino compatible. The working voltage is 5V, so use a suitable power source. The 5 buttons can be used to select menu items or control different functions. You can easily drive the 4 digit 7 segment display using I2C. When it comes to maintenance, keep it in a dry and clean place. Avoid exposing it to extreme temperatures or humidity. If you have any questions, refer to the product wiki or other available resources for more help.