Using this clock is easy. First, pick a time card from the 13 double - sided ones and place it in the holder at the top of the clock. Then, move the hands on the clock to match the time shown on the card. Slide open the 'digital clock' window to check if you got it right. After you're done, put the card back in the storage slot at the back of the clock. As for maintenance, keep the clock in a dry place to avoid damage. Don't use sharp objects on it as it might scratch the clock face. Also, handle the time cards gently so they don't get bent or torn. This clock is designed for kids, so make sure to supervise younger children during play to prevent any accidental swallowing of small parts.