The Qubie prototype is simply a Raspberry Pi computer connected to a Wi-Fi network adapter and a portable power source. Open-source software uses the adapter to count the wireless transmitters—i.e., cellphones—in a given area, without collecting personal identifying information. For now, the resulting data is sent to Free & Fair’s proprietary software for analysis. The engineers tested Qubie during the California primaries this June and plan to deploy them in several more polling places for the general election. This information will help them learn more about polling-place traffic, including the best times to vote. Eventually, Zimmerman hopes to produce a cheaper version of Qubie that can update a public-facing website in real time, alerting people to how long their wait will be at their polling place.