🚪 SONOFF DW2 — WiFi Wireless Door & Window Sensor · No Hub Required
The SONOFF DW2 is a WiFi-connected door and window sensor that sends instant notifications to your phone when a door or window is opened or closed. Connects directly to your 2.4GHz WiFi network — no Zigbee hub or gateway required. Two-piece magnetic reed switch design: mount the transmitter on the door/window and the magnet on the frame. Create eWeLink smart scenes to trigger other devices — lights on when you open the front door, alarm when a window opens while you're away. Battery powered (2 × AAA) with up to 3 months battery life.
⚡ Key Features
- No Gateway Required — connects directly to your 2.4GHz WiFi via the eWeLink app; paired via Bluetooth, controlled via WiFi; no Zigbee hub or RF bridge needed
- Real-Time Open/Close Notifications — instant push notification to your phone whenever the door or window is opened or closed; know immediately if someone enters your home
- Separate Open & Close Triggers — the DW2 sends different signals for opening and closing, so you can create separate automations for each (e.g., door opens → light on; door closes → light off)
- Smart Scene Triggers — link the DW2 with other eWeLink/SONOFF devices: open front door → hallway light on; window opens while armed → send alarm notification; fridge door open too long → phone alert
- Camera Binding — link a SONOFF WiFi camera to the sensor; when the door opens, view the camera feed directly from the sensor page in the app to see who's there
- 3-Month History Log — automatically saves up to 3 months of open/close events; review when doors and windows were accessed
- Low-Battery Alert — real-time battery level display in the app; push notification when battery is low so you never miss a security alert
- Peel & Stick Installation — includes 3M adhesive pads; mount in seconds on door frames, window sills, drawers, or cabinets; no drilling needed
- Battery Powered — 2 × AAA batteries (not included); up to ~3 months battery life at typical usage (3 open/close events per day)
The DW2 requires 2 × AAA 1.5V batteries (not included in the box). Battery tip: wrap a single layer of electrical tape around each battery before inserting — the internal clips can be tight and may nick the battery wrapper.
🏠 Use Cases
Front Door Security
Get notified instantly when your front door opens. Link to a SONOFF camera to see who it is. Arm the sensor when you leave — any opening triggers an alert to your phone. Basic but effective smart security.
Auto-Lights on Entry
Create a scene: when the front door opens after sunset, turn on the hallway light via a SONOFF smart switch. When the door closes, start a 5-minute countdown then turn off. Hands-free welcome lighting.
Window Monitoring
Place on windows in bedrooms or offices. Get notified if a window is opened while you're away or sleeping. Multiple DW2 sensors can cover every entry point — each connects independently via WiFi.
Fridge / Freezer Alert
Stick the DW2 on your fridge or freezer door. Set an automation: if the door stays open for more than 2 minutes, send a notification. Prevents food spoilage and wasted electricity.
📋 Technical Specifications
| Model | DW2-Wi-Fi |
| Connectivity | WiFi IEEE 802.11b 2.4GHz (no hub required) |
| Pairing | Bluetooth (initial setup), WiFi (operation) |
| Battery | 2 × AAA 1.5V (not included) |
| Battery Life | ~3 months (3 open/close events per day) |
| Quiescent Current | ≤ 40 µA |
| Working Voltage | DC 3V |
| History Log | 3 months (auto-saved) |
| Material | PC V0 (flame retardant) |
| Operating Temp | -10°C to 40°C |
| Mounting | 3M adhesive pads (included) |
| App | eWeLink (iOS / Android) |
| Voice Control | Alexa, Google Assistant (via eWeLink scenes) |
| Certifications | CE, FCC, RoHS, ICASA |
🔔 DW2 (WiFi) vs SNZB-04P (Zigbee)
The DW2 connects directly to WiFi — no hub needed, quick to set up, but uses more battery power (~3 months). The SNZB-04P uses Zigbee — requires a Zigbee hub but lasts up to 5 years on a coin cell battery and has better range via the Zigbee mesh network. Choose DW2 for simplicity; choose SNZB-04P for longer battery life and a Zigbee ecosystem.
❓ Frequently Asked Questions
Does it need a Zigbee hub?
Can I use it to trigger other smart devices?
How long do the batteries last?
Can I use it outdoors?
Why won't it connect to my WiFi?
🤝 Need Help? We're Here for You!
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8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709
Know When Every Door Opens.
SONOFF DW2 WiFi Door & Window Sensor