Description
Wireless door-window sensor that immediately alerts you via smartphone when doors or windows are opened. Operates on 433 MHz technology with a battery life of up to 2 years.
About this product smart access sensor
The Sonoff DW2 RF is a wireless door-window sensor that immediately sends a notification to your smartphone when doors or windows are opened. This access sensor operates on 433 MHz technology and is an essential part of a smart security system.
With the eWeLink app, you can view historical records from the past 3 months and link the sensor to other smart devices. For example, you can have lights automatically turn on when a door is opened. The sensor works with SONOFF Bridge for extensive automation possibilities and IFTTT integration.
The sensor features 3M adhesive for easy, tool-free installation. Its compact design works in any direction, as long as the magnet remains within 5 mm of the sensor. With low power consumption, the battery lasts up to 2 years with normal use.
Perfect for home security, lighting automation, or monitoring cabinets and drawers. The sensor can be shared with multiple family members, keeping everyone informed of the status of access points.
Features 6 properties
- 433 MHz wireless - reliable connection without needing WiFi for the sensor itself
- Smartphone notifications - instant alerts via eWeLink app when door/window opens
- Long battery life - up to 2 years of use due to energy-efficient technology
- Historical tracking - view opening and closing history for the past 3 months
- Automation options - link to lighting and other smart devices
- Easy installation - 3M adhesive, no screws or tools needed
Specifications technical details
| Frequency | 433 MHz |
| Color | White |
| Dimensions | 75 × 48 × 25 mm |
| Product height | 72 mm |
| Product width | 22.5 mm |
| Wireless connection | Yes |
| App control | eWeLink app |
| WiFi required | Yes (for bridge/hub) |
| Power source | USB (for charging) |
| Installation method | 3M adhesive |
| CE marking | Visible |
| Warranty | 1 year |
What's in the box? 2 components
Sensor components
- Sonoff DW2 RF wireless door-window sensor
- Magnet for detection
Frequently asked questions 4 questions
Do I need a SONOFF Bridge for this sensor?
Not for basic notifications on your phone, but yes for automations with other devices. The Bridge connects 433 MHz sensors to your WiFi network for extended functionalities.
How long does the battery last?
Up to 2 years with normal use due to the energy-efficient 433 MHz technology. The actual lifespan depends on how often the door/window is opened.
Can I mount the sensor on different materials?
Yes, the 3M adhesive sticks to most smooth surfaces such as wood, plastic, and metal. Ensure the magnet remains within 5 mm of the sensor for reliable detection.
Does the sensor also work upside down or sideways?
Absolutely, the sensor works in any position. The only important thing is that the magnet remains within 5 mm distance of the sensor for correct operation.
Warranty & returns terms and conditions
- Caasi warranty - 1 year: product defective? Contact Caasi. We will arrange free repair or replacement. If the product is no longer in our assortment, you will be refunded the current market value.
- Covered: defects in material and manufacturing under normal use
- Not covered: wear and tear, fall or impact damage, improper use
- Return policy: 30-day cooling-off period - not satisfied? Return for free
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