Lagute ZYS-09LM Touchless Infrared Motion Sensor Automatic Stainless Steel Trash Can Garbage 9 Liter/2.38 Gallon Sensor distance is about 10cm away from the sensor window. The cover will open when you put any object in front of the sensor window. The cover will close antomatically 5-6 seconds later after throwing the rubbish into the bin. 4 PCS AA-size batteries(not included) operated, last 3-6 months for normal household use. Size: 27.5 x 19.5 x 36.6 CM