When selling your home. Realise the video doorbell is included in the sale of the home. If you're attached to that particular one, either install a different one, remove it completley or write it as an exception before the house is photographed and listed.
If the security system in the home is paid for; it is typically included in the purchase contract of the house. Your REALTOR® should state otherwise within the listing if you desire to keep it.
To advoid any snags, ask your REALTOR® to make sure the exact model of appliances that are staying with the house purchase are wriitten in the listing.