Wireless and autonomous solution that allows to know the opening and closing of the doors of homes, second homes, garages, offices, bars, business premises, urbanizations, as well as windows and any type of wardrobe, thanks to a low-cost hardware device Together with this SAYME Gate APP, all this autonomously based on NB-IoT, LET-M communications technology, without the need for connection to any telephone or additional hardware. This APP will allow you to receive notifications on your phone wherever you are, it records and stores all events.