The Tire Toggle is designed to be small and efficient, and it is about the same size as a vehicle spark plug. One end is screwed onto the valve stem of a tire to be filled, while the other end is connected to the line from the air pump. There are rubber grips around the end that screws onto the valve, making it easier to grip when attaching and removing the device from the tire that needs filling. Once attached between the hose and the tire, the user will see the current air pressure in big, bold numbers on the lighted display screen. When enough air has been pumped into the tire, the device will beep, and it can be removed from the valve stem.