100% new high quality Made of high quality materials for durability It is best to replace the spare parts every 2 to 3 months to keep your sweeping robot running at peak performance. [filter screen replacement] replace the filter screen, start up the machine, reset the purifier, and then it can work normally [applicable model] ac4004, other models can check the size, the same size can be general [product name] filter screen of purifier [filter model] Purple AC4121, black AC4123, white AC4124 [product size]: Ac4121 size: 312 * 290 * 9mm Ac4123 size: 312 * 288 * 10 mm Ac4124 size: 317 * 291 * 18mm Color: Purple/White/Black Material: ABS Package Contents: 1 * Filter elements

100% new high quality Made of high quality materials for durability It is best to replace the spare parts every 2 to 3 months to keep your sweeping robot running at peak performance. [filter screen replacement] replace the filter screen, start up the machine, reset the purifier, and then it can work normally [applicable model] ac4004, other models can check the size, the same size can be general [product name] filter screen of purifier [filter model] Purple AC4121, black AC4123, white AC4124 [product size]: Ac4121 size: 312 * 290 * 9mm Ac4123 size: 312 * 288 * 10 mm Ac4124 size: 317 * 291 * 18mm Color: Purple/White/Black Material: ABS Package Contents: 1 * Filter elements