EMART Touchless Automatic Motion Sensor 17gallon&9gallon Trash Can, Set of 2 stainless steel One large is 17 gallon(65L)and one small is 9 gallon(35L) trash cans Set of 2 touchless trashcans seal odors in and eliminate cross-contamination of germs Water-resistant infrared motion sensor detects motion within inches of sensor range; interior garbage bag ring and black plastic liner can Smaller can runs on 4 AA-size batteries; Larger can runs on 4 D-size batteries (not included) energy saving technology keeps battery life 20% longer