Enable the door open or close even when you are not at the site. ※ You don't need to buy a Hub for this device, this device connects to the WiFi of the House. But a strong WiFi signal is a must for this device, try to connect your phone to WiFi(2.4GHz) next to the engine, if cellphone can connect to this Wifi and surf the Internet normally, then our garage door opener can also connect to this Wi-Fi.
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