W5 Networks, a Fremont start-up that provides a way for retailers to wirelessly update price labels on their shelves, has raised $12 million in a second round of funding.

Frazier Technology Ventures led the round along, with previous investors Thomas Weisel Venture Partners and U.S. Venture Partners also participating. The latest round brings W5 Networks’ total funding to $22 million.

Electronic shelf labels (ESLs) simplify the process of updating shelf price labels by allowing retailers to transmit pricing information wirelessly to small displays that replace paper shelf labels.

It offers each electronic label for less than $5.