Easy to install: The device can be opened with a slight twist, so you can the filter and a simple replacement. Snaps into place for quick and effortless replacement, no need to. Compatible: This replacement filter is only compatible with VC100 cordless vacuum cleaner (confirm your robot purchase) Replacement Frequency: To maintain good performance, we recommend cleaning the filter once a month and replacing it every 3 months. Easy to replace as part of routine maintenance, perfectly matched to the equipment. Replacing your filter regularly will also help the cleaning performance and suction of your vacuum cleaner. Replacement parts to maintain and improve your vacuum cleaner. Note: The data are all measured manually, please allow an error of 1-3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.