Everything you need to setup Video Doorbell 3, Video Doorbell 3 Plus, Video Doorbell 4, or Battery Doorbell Plus in just a few minutes, including a screwdriver, level, charging cable, security screws, mounting screws, drill bit, wire extenders, wire nuts, adapter plate, adapter screws, terminal screws, and stickers. Have an existing Video Doorbell? The included adaptor plate allows you to upgrade without drilling new holes during installation.