Flair Pucks, when not powered by AC, use two AAA batteries.
Flair Smart Vents, when not powered by AC, use two C-Cell Batteries.
Both devices are designed for use with Lithium or Alkaline batteries, but may work with other chemistries such as rechargeable NiMH as well.
Batteries are included with Flair Pucks and Smart Vents.
Flair Pucks ship with (2) Energizer Ultimate Lithium AAA batteries as well as a USB cable and adapter for those who wish to run the Flair Puck on AC.
This is an example of the Energizer Ultimate Lithium batteries that come with the Flair Puck.