The SONOFF DW2 WiFi Door & Window Sensor is a smart wireless security sensor designed to monitor the opening and closing of doors and windows in real time.
Using a magnetic detection system, the sensor sends instant notifications to your smartphone through the eWeLink mobile app whenever a door or window is opened or closed.
With direct 2.4GHz WiFi connectivity, the SONOFF DW2 does not require an additional hub or gateway, making it an easy solution for smart home security and automation.
Key Features
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Door & Window Detection: Monitors opening and closing using magnetic sensing technology.
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Instant Notifications: Receive smartphone alerts when a door or window is opened or closed.
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WiFi Connectivity: Connects directly to a 2.4GHz WiFi network without a separate hub.
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eWeLink App Control: Monitor sensor status remotely through Android and iOS devices.
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Smart Home Automation: Trigger compatible eWeLink devices based on door or window status.
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Activity History: View opening and closing records through the eWeLink app.
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Battery Powered: Wireless operation without external power wiring.
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Low Battery Notification: Receive alerts when battery power is running low.
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Compact Design: Suitable for installation on doors, windows, cabinets, and other compatible surfaces.
Technical Specifications
| Parameter |
Specification |
| Brand |
SONOFF |
| Model |
DW2-Wi-Fi |
| Product Type |
Wireless Door & Window Sensor |
| Detection Method |
Magnetic Contact |
| Operating Voltage |
3V DC |
| Battery Type |
2 × AAA 1.5V Batteries |
| Wireless Connectivity |
WiFi 2.4GHz |
| WiFi Standard |
IEEE 802.11 b/g/n |
| Mobile Application |
eWeLink |
| Gateway Required |
No |
| Operating Temperature |
-10°C to +40°C |
| Main Sensor Dimensions |
Approximately 70 × 31 × 19mm |
| Color |
White |
| Installation |
Surface Mounted |
How It Works
The SONOFF DW2 consists of two components:
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Main Sensor: Detects changes in the magnetic field and communicates with the WiFi network.
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Magnetic Contact: Mounted on the moving door or window.
When the door or window opens, the magnetic contact separates from the sensor, triggering a status update and notification through the eWeLink app.
Installation Instructions
- Install two AAA batteries in the main sensor.
- Download the eWeLink app on your smartphone.
- Pair the sensor with a 2.4GHz WiFi network.
- Attach the main sensor to the fixed door or window frame.
- Attach the magnetic contact to the moving section.
- Align both components according to the manufacturer's installation instructions.
- Test the opening and closing detection through the app.
Applications
- Smart Home Security
- Door Opening Detection
- Window Monitoring
- Office Entry Monitoring
- Cabinet and Storage Monitoring
- Smart Lighting Automation
- Home Automation Systems
- Remote Property Monitoring
Important Notes
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WiFi Requirement: Supports 2.4GHz WiFi networks only.
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Battery Requirement: Requires two AAA batteries.
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No Gateway Required: Connects directly to a compatible WiFi network.
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Internet Connection: Remote notifications and cloud functions require internet connectivity.
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Indoor Use: Not designed for direct exposure to rain or harsh outdoor conditions.
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Installation: Proper alignment between the magnetic contact and main sensor is required.
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Security: This is a monitoring sensor, not a standalone alarm siren or door-locking system.
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Model Compatibility: These specifications apply to the SONOFF DW2 WiFi version, not the DW2 RF 433MHz version.
Package Includes
- 1 × SONOFF DW2 WiFi Main Sensor
- 1 × Magnetic Contact
