Key Features. Add-on to your existing Arlo audio doorbell Instant motion & sound alerts Adjustable volume & variety of sounds Smart Siren 80+ decibel Requires existing base station. Add-on for Arlo Audio Doorbell Add the Arlo Smart Chime to any indoor wall outlet to get instant chime alerts when someone presses your Arlo Audio Doorbell. Wire-free Wall-plug Design Simply plug-in the Arlo Chime into a wall-plug & add to your Arlo account to start receiving audio notifications. Place in Any Room Arlo Chime can be placed throughout the house to keep you alerted whenever your Arlo Doorbell is pressed..