A common characteristic of tuned product managers is the passion they have for their work and the products they manage. Their passion shows through when they interact with the product team or speak to customers; they communicate their enthusiasm by their actions. Ivan at The Productologist wrote a great post about the importance of being passionate about your products. He explains,

Product Managers have to be passionate about their products in order to energize others about it. Passion can come in a variety of flavors, but no matter how you feel about your product(s), you have to be passionate if you expect others to be.