High-tech, fully automatic pump with easy-to-use pressure control
features self-contained design, auto start/stop button with quick air
release valve, and flanged base for secure seal. Easy-to-read LED
display measures PSI vacuum inside the cylinder with universal
measurements on cylinder to track results. Three donuts included: 0.75
in. diameter, 1 in. and 1.25 in. USB rechargeable with cord included.