The 21 Gallon Stainless Steel Infrared Trash Can by Nine Stars has an infrared motion sensor and a hands-free automatic opening lid so you don't have to touch the trash can to open it. The trash can also has manual Open/Close buttons, a power-saving On/Off switch and a garbage bag retainer ring. This stainless steel trash can is rust-proof and easy to clean. The hidden battery compartment requires 4 "D" batteries (not included). A two-year warranty covers the lid. Infrared sensor inductive automatic lid opening function * Uses normal garbage liner Removable top part for easy change of liner Liner retaining ring to hold garbage bag inside Touchless garbage disposal Prevent cross contamination from the trash can