Peace, mercy, and blessings of God be upon you. For sale: a smart door and window sensor from the well-known company SONOFF, model DW2-Wi-Fi. Device condition: The device is new and unused. Device features and benefits: - Connects directly to your home Wi-Fi (2.4 GHz frequency) without the need for a hub. - Sends you an instant alert on your mobile via the eWeLink app as soon as the door or window is opened. - Supports integration with Alexa and Google Assistant (Google Home). - Works with two regular remote batteries (AAA), and its battery consumption is very low, allowing it to last a long time. - You can create smart scenarios with it (e.g., as soon as the room door opens, the light or AC turns on automatically). Very important note for credibility (the matter is very simple): The sale includes the main large smart electronic piece (shown in the pictures). You need any small magnet, and you can operate the device simply and 100% efficiently by bringing any small magnet you have at home close to it (like a fridge magnet or a toy magnet). The sensor works by detecting any magnetic field; the matter is very simple.