Sonoff DW2 wireless door and window sensor

Sonoff DW2 is a new improved version of Sonoff's DW1 door / window sensor, but uses WiFi (and not RF) as the connection method. The advantage of this version of the product is that it does not require a gateway (or RF receiver device) to connect to the cloud because it uses WiFi and connects directly to the WiFi router.
The product consists of two parts: one to be fixed on the door or window, the other part to be attached to the door or window frame. When the magnetic connection detects the opening of the door or window, the device can send an alert signal to your phone or other Sonoff and SmartWise devices via the eWeLink cloud.
Connects to other Sonoff smart devices - e.g. lights, sensor-controlled relay switches - via eWeLink smart home cloud wireless, no wiring required. The power source is provided by two pieces of AAA 3V battery, (not included in the product).
Through the eWeLink app you can receive alerts on any movement (opening, closing) to your iOS / Android smartphone, easy to use as a simple alarm. When the alert function is enabled, the alert is only sent to the owner's eWeLink account, and the alert cannot be sent to shared accounts.
It has smart scene function, door/window open can trigger multiple eWeLink compatible Sonoff and SmartWise WiFi devices (smart switches, smart relays and smart sockets) via eWeLink app
When used with an eWeLink compatible camera (Sonoff or SmartWise), the real-time camera image can be displayed on the sensor's open/closed status screen, so the open status can be immediately confirmed on a real-time video stream .
 
Product features:
Ultra-low consumption microprocessor
Battery status is displayed in the app, low battery warning can also be set Built-in
WiFi antenna
Trigger both opening and closing
Double-sided fixing adhesive included
Easy to install and set without cables
Sensor status data can be stored together with others who own an eWeLink account (free)
Power supply: 2pcs AAA battery (not included)
3 months open / close history stored in the eWeLink cloud