Sonoff SNZB-04PR2 SenseGuard Gen2 | Slim Zigbee Door/Window Sensor

Sonoff SNZB-04PR2 SenseGuard DW Gen2: Slim Zigbee 3.0 Door and Window Sensor with Anti-Tamper

Do you want to optimally secure access to your home or start automatic scenes as soon as a door or window opens? The Sonoff SNZB-04PR2 (SenseGuard DW Gen2) is the advanced successor to Sonoff's well-known door and window sensors. With its extremely slim profile of only 13.5 mm deep, contactless Hall sensor technology, and built-in physical anti-tamper button, this is the ideal wireless contact sensor for any frame. Also, check out our complete range of sensors for a fully secured home.

Contactless Hall Sensor & Ultra-Slim Profile for Every Window Frame

Unlike traditional window sensors that use a mechanical reed switch, the Sonoff SNZB-04PR2 is equipped with an advanced Hall sensor. This means no mechanical friction or wear, ensuring a significantly longer lifespan and extremely reliable status detection. Thanks to its streamlined design of 90 x 26 x 13.5 mm, this Gen2 sensor is barely noticeable and fits perfectly on narrow plastic, wooden, or aluminum window and door frames.

Economical AAA Power & Active Tamper Protection (Anti-Tamper)

One of the biggest practical upgrades of the SenseGuard DW Gen2 is its use of two standard AAA batteries. These are inexpensive to purchase and easy to replace, while the sensor, thanks to the energy-efficient Zigbee 3.0 protocol, lasts up to 3 years. Furthermore, there is a physical anti-tamper button on the back. Should an unauthorized person try to pull the sensor from the frame or door, a tamper alarm will immediately be sent to your smart home controller.

Ecosystems & Compatibility

• Home Assistant: Works excellently via ZHA and Zigbee2MQTT (Z2M) in combination with a suitable Zigbee coordinator. All entities (door/window contact, battery level, and anti-tamper status) are made directly available locally.
• Homey Pro: Seamlessly added via the official Sonoff Zigbee app on the Homey Pro to record open/closed status and tamper attempts in your Advanced Flows.
• SmartThings: Connects directly to the Samsung SmartThings Hub via the Zigbee 3.0 protocol for receiving push notifications and activating security scenes.

Pro-Tip from slimhuisje.nl: Link the anti-tamper entity of the SNZB-04PR2 in Home Assistant to a loud siren and a notification to your smartphone. Even if an intruder tries to dismantle the sensor before opening the door, the alarm will already sound!

Functionalities & Physical Actions

• Contactless Hall sensor technology without mechanical wear.
• Physical anti-tamper button on the back for immediate tamper alarming.
• Ultra-slim and compact design (13.5 mm deep) for discreet mounting.
• Zigbee 3.0 protocol for a fast, local, and energy-efficient wireless connection.
• Powered by 2x standard AAA batteries for economical and easy maintenance.
• Easy mounting with the included double-sided 3M adhesive strip.

Package Contents and Dimensions

• 1x Sonoff SNZB-04PR2 SenseGuard DW Gen2 Zigbee Door/Window Sensor
• 1x Magnet Unit
• 1x Double-sided 3M tape set
• 1x Quick Start Guide
• Product Dimensions: 90 x 26 x 13.5 mm (sensor) | 43 x 12.5 x 13 mm (magnet)

Please note: A compatible Zigbee gateway or Zigbee coordinator is required for the use of this Zigbee 3.0 door/window sensor. 2x AAA batteries are not included as standard.

Technical specifications

Frequently Asked Questions (FAQ)

What is the difference between the Sonoff SNZB-04P and the SNZB-04PR2 Gen2?

The Gen2 (SNZB-04PR2) is significantly slimmer (13.5 mm deep vs. 21.9 mm), uses a wear-resistant Hall sensor instead of a mechanical reed switch, has a physical anti-tamper button for tamper protection, and runs on standard AAA batteries instead of a specific coin cell.

Are batteries included with the Sonoff SNZB-04PR2?

No, the sensor operates on 2x AAA batteries, which are not included as standard. You can order economical AAA alkaline or lithium batteries directly with your purchase.

How does the physical anti-tamper protection work?

On the back there is a spring-loaded push button that remains pressed when the sensor is securely mounted on the door or frame. Should someone pull the sensor off or dismantle it, the button will release, and the sensor will immediately send a tamper alarm to your smart home platform.

Do I need a special hub or Zigbee coordinator?

Yes, the SNZB-04PR2 communicates via the Zigbee 3.0 protocol. You need a compatible Zigbee hub, such as a Zigbee USB controller for Home Assistant, a Homey Pro, or a Tuya Zigbee gateway.

Can this door/window sensor also be used outdoors?

The SNZB-04PR2 is primarily designed for indoor use. For outdoor use (such as on a garden gate or shed window), the sensor must be mounted completely sheltered from moisture and splashes.

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