The TP-Link Tapo Smart Hub H200 manages all your IoT sensors. It is battery-powered and simplifies installation as no cables are required. It can accommodate up to 64 IoT sensors, smart buttons, switches and 4 video doorbells or 4 cameras. It can also be used as an alarm system. It coordinates with Tapo's smart sensors to notify you of security issues or other problems. Up to 64 sensors + 4 doorbells or cameras, storage through Micro SD, Tapo app.Up to 64+4 Devices - up to 64 smart sensors, buttons or switches + 4 cameras or video doorbells Smart Alarm & Chime -19 Ringtone Options Local microSD Storage - up to 512 GB Voice Control - Works with Amazon Alexa and Google Home Low -Power Wireless