Up to 64+4 DevicesConnect more devices (up to 64 switches, sensors, or buttons + 4 cameras or doorbells) to create your home's smart ecosystem. Works with Tapo C420, Tapo C400, Tapo D230, and more Smart Alarm & ChimeWorks with your smart cameras (Tapo C420, Tapo C400), video doorbells (Tapo D230), and sensors as a smart alarm or chime when motion is detected or a visitor arrives Local microSD StorageSave recorded videos from your cameras or video doorbells to the hub-installed microSD card (up to 512 GB)19 Ringtone OptionsMultiple built-in ringtones (up to 90dB) for your customized scenarios Low-Power WirelessHelps your smart sensors and buttons last up to 10 times longer by adopting an ultra-low power wireless protocol** Voice Control- Works with Amazon Alexa and Google Home for hands-free automation Build Your Tapo Security EcosystemSmart living starts here with up to 64 smart sensors, buttons or switches + 4 cameras or video doorbells connected to your smart home ec