The N79W provides an efficient. versatile cleaning solution thanks to multiple specialized cleaning modes. including Max Mode. and an integrated 3-Stage Cleaning System. Use Ecovas App or your smart home devices to conveniently customize and direct cleanings based on your unique cleaning needs. Along with the N79W you will receive the DN622-KTA service kit. We recommend to change the main brush once. side brushes twice and filters three times a year. With the new Buddy Packs Ecovas offers a practical and cost-effective solution to keep your DEEBOT in ship-shape for one year. The distance of time between changing the components depends on the frequency of usage. The DEEBOT Buddy Service Kits come with everything you'll need to keep your DEEBOT operating at peak performance.