SONOFF Smart Door Window Sensor, Wi-Fi (DW2-WIFI)

SONOFF Smart Door / Window Sensor, Wi-Fi 
 SONOFF smart home system allows you to control your electrical appliances remotely with the EWeLink app or by voice with Amazon Alexa or Google Home. It allows you to create different scenarios, group appliances by switching on/off multiple devices with a single touch, set timers and schedules, monitor the status of your devices in real time, and share their control. Link your eWeLink with IFTTT application and extend your scene capabilities. Thanks to configurable local LAN support Sonoff smart home system can work without a cloud server. 
 Features: This product is a smart door/window sensor to help you monitor the status of your doors or windows. Set sensor’s settings using free mobile APP eWeLink (Android, IOS). No gateway required. The sensor is paired with APP via Bluetooth and is controlled on APP via Wi-Fi. It can sense the open or closed status of a door or window by closing and detaching the sensor from the magnet. The dual sensor design allows for greater installation flexibility and adaptability. Suitable for windows and doors of various models, both hinged and sliding.  Tool-free installation: adopts 3M adhesive on the bottom of the sensor without damaging the surface. Made of PC flame retardant V0 plastic. Suitable for homes, villas, factories, computer rooms, shops, hotels, office buildings, banks and many other places to monitor for possible intrusion.  This device can be combined with various other products to complement smart home scenarios, such as turning on a light when the door is opened, or a video camera, etc.
 Notes: Align the installation, the distance between the sensor and the magnet should be less than 5mm. Sensor should be installed in fixed area like door frame, the magnet can be installed in active area like door plank.
 Technical specifications: Static current: <=40uA. Detecting distance: >15mm. Wi-Fi frequency: 2.4 GHz. Wi-Fi standard: IEEE802.11b/g/n. App: eWeLink (Android, iOS). Operating voltage: DC 3V (2x 1.5V AAA battery, - batteries are NOT included). Operating temperature: -10°C~+40°C. Operating humidity: 5%-95%RH (non-condensing). Mounting: on the door/window (3M adhesive). Distance between devices: <5mm. Dimensions: Detector: 70x31x19 mm. Magnet: 42x14x16 mm Material: PC. Safety class: V0 (flame-retardant). Color: white. Weight: 28g.
 Warranty: 24 months.