The DW2 is a door and window alarm sensor. The door alarms operate using the Sonoff RF Bridge 433. The DW2 door alarm sensor connects to a Sonoff Bridge 433, detects when a door or window is opened, and immediately sends an alarm notification to the eWeLink app.

Ultra-low power dedicated magnetic microprocessor
It supports a wireless frequency of 433.92MHz
Wireless transmission distance of 20 m (line of sight)
Built-in antenna provided
Less than 1 microampere quiescent current.

• Battery type required: 2 x AAA
• Wireless frequency: 433.92MHz
• Protocol: EV1527
• Quiescent current: ‰¤6µA
• Emission current: ‰¤10mA
• Operating environment: -10°C - 50°C
• Product size: 70 x 32 x 19 mm
• Weight: 45g
• Compatible with RF Bridge equipment