# SONOFF's $22.90 door sensor runs Matter over Thread or Zigbee, and its tamper alert needs Zigbee SONOFF started selling the SenseGuard DW Gen3 (SNZT-04P) on November 10: a battery door and window sensor that joins Matter controllers over Thread or pairs with a Zigbee hub. In Thread mode every platform gets open and closed, Alexa misses the battery level, no platform gets the tamper alert, and only Home Assistant can update its firmware over Matter. Canonical page: https://matterhome.io/news/sonoff-senseguard-dw-gen3-thread-zigbee-door-sensor Markdown page: https://matterhome.io/news/sonoff-senseguard-dw-gen3-thread-zigbee-door-sensor.md Author: Matterhome Editorial Team Author profile: https://matterhome.io/authors/matterhome-editorial-team Editorial lead: JC Martinez Editor profile: https://matterhome.io/authors/jc-martinez Published: 2026-11-11T03:30:00.000Z Category: Device launch Tags: SONOFF, Matter, Thread, Zigbee, Sensors ## Feature Image - Origin: sourced - Image: https://assets.matterhome.io/content/news/2026-11-11-sonoff-senseguard-dw-gen3-thread/feature.398efdb719f55fa57172/source.webp - Alt text: White SONOFF SenseGuard DW Gen3 sensor body standing beside its smaller rectangular magnet - Caption: Official SONOFF store image of the SenseGuard DW Gen3, cropped and placed on a wider white background for this page. - Source: https://cdn.shopify.com/s/files/1/0742/9963/8001/files/SNZT-04P_1.avif ## Sources - https://sonoff.tech/products/sonoff-senseguard-dw-gen3-smart-door-window-sensor-snzt-04p - https://sonoff.tech/de-de/products/sonoff-senseguard-dw-gen3-smart-door-window-sensor-snzt-04p - https://help.sonoff.tech/docs/snzt-04p - https://on.dcl.csa-iot.org/dcl/compliance/compliance-info/4897/363/1/matter - https://csa-iot.org/csa_product/smart-door-window-sensor-7/ - https://sonoff.tech/products/sonoff-senseguard-dw-gen2-zigbee-door-window-sensor-snzb-04pr2 - https://on.dcl.csa-iot.org/dcl/compliance/compliance-info/4897/357/1/matter - https://on.dcl.csa-iot.org/dcl/compliance/compliance-info/4897/369/1/matter - https://support.sonoff.tech/snzt-03p-usermanual-2/ SONOFF started selling the SenseGuard DW Gen3 (model SNZT-04P) in its own online store on November 10, 2026. It is a door and window contact sensor that runs on two AAA batteries and works in one of two modes: Thread, where it joins Apple Home, Google Home, Alexa, SmartThings or Home Assistant directly as a Matter device, or Zigbee, where it pairs with a SONOFF gateway, an Echo or SmartThings hub with a Zigbee radio, or Home Assistant through ZHA or Zigbee2MQTT. Thread is the default. [SONOFF's store](https://sonoff.tech/products/sonoff-senseguard-dw-gen3-smart-door-window-sensor-snzt-04p) lists it in stock at $22.90, and its [German store](https://sonoff.tech/de-de/products/sonoff-senseguard-dw-gen3-smart-door-window-sensor-snzt-04p) at €22.90. The sensor was [certified](https://on.dcl.csa-iot.org/dcl/compliance/compliance-info/4897/363/1/matter) on August 7 as a Matter 1.5 device that connects over Thread. SONOFF's earlier door sensors, the SNZB-04P and the [SenseGuard DW Gen2](https://sonoff.tech/products/sonoff-senseguard-dw-gen2-zigbee-door-window-sensor-snzb-04pr2) (SNZB-04PR2), are Zigbee-only, so they reach Apple Home or Google Home only through a hub that translates for them. The Gen2 sells for $13.90. The roughly $9 extra for Gen3 buys the Thread radio and the choice between the two networks. In Thread mode the sensor needs a Thread border router from your Matter platform, such as a HomePod mini or a Thread-capable Nest, Echo or SmartThings hub; it does not need any SONOFF hardware. ## Thread mode reports open and closed, and the tamper alert stays behind The store page advertises tamper detection that alerts you when someone pries the sensor off the frame. SONOFF's [support page](https://help.sonoff.tech/docs/snzt-04p) shows that the alert works only in Zigbee mode. Its compatibility table gives each platform these features in Thread mode: | Thread mode | Apple Home | Google Home | Alexa | SmartThings | Home Assistant | | --- | --- | --- | --- | --- | --- | | Open and closed | Yes | Yes | Yes | Yes | Yes | | Battery level | Yes | Yes | No | Yes | Yes | | Tamper alert | No | No | No | No | No | | Firmware update over Matter | No | No | No | No | Yes | Open and closed is the job most people buy a contact sensor for, and every platform gets it. If you want to know when a sensor is ripped off a door, you need Zigbee mode and a hub that carries the alert, which rules out an Echo. With a SONOFF gateway the alert arrives in the eWeLink app; SONOFF's tables show no route that brings it into Apple Home or Google Home. If you use Alexa, plan on checking the batteries yourself: SONOFF's tables give Alexa no battery reading over Thread, or over Zigbee through an Echo hub. Firmware is the other wrinkle. Current firmware is version 1.0.6, and in Thread mode the sensor has two update routes: Home Assistant over Thread, or the eWeLink app over Bluetooth from a phone near the sensor. Apple Home, Google Home, Alexa and SmartThings cannot push an update over Matter, and SONOFF does not say whether the Bluetooth route works while the sensor stays paired to one of them. ## Switching modes wipes the pairing Pressing the sensor's button five times moves it to Zigbee mode, and SONOFF warns that switching resets the sensor. Changing networks later means pairing it again and rebuilding every automation that uses it, so choose the mode first. In Zigbee mode, SONOFF's table gives the tamper alert to its ZBBridge-P, ZBBridge-U, iHost and NSPanel Pro gateways, to SmartThings through an Aeotec Smart Home Hub v3, and to Home Assistant through ZHA or Zigbee2MQTT. The original ZBBridge, the Echo hubs and a FRITZ!Box 7690 report open and closed without it. SmartThings and ZHA currently need an add-on from SONOFF to recognize the sensor: an Edge driver channel for SmartThings and a script for ZHA. ## Where it beats IKEA's cheaper sensor For a closet light or a back door in a Thread home, [IKEA MYGGBETT](/devices/ikea-myggbett-door-window-sensor) does the same open-and-closed job for about half the US price and a third of the German one, but its two halves must close to within 5 mm of each other. The SONOFF works with a closed gap of up to 30 mm with the magnet mounted horizontally, or 15 mm vertically, and the magnet comes out of its housing so it can be mounted on its own. It also ships with its batteries, which MYGGBETT leaves out. That makes the SONOFF a better fit for recessed windows and frames with thick trim. Among the Thread sensors Matterhome has reviewed, it also costs less than the [Aqara Door and Window Sensor P2](/devices/aqara-door-window-sensor-p2) or [Eve Door & Window](/devices/eve-door-window). The Zigbee option is most useful to Home Assistant owners who run Zigbee2MQTT or ZHA today and may move to Thread later. Home Assistant is also where Thread mode does the most, since it alone can identify the sensor and update it over Matter. If you run Zigbee and have no plans to change, the Gen2 is the cheaper buy with a tamper alert of its own, and SONOFF rates its AAA batteries for up to three years. SONOFF's store listing and support page give no battery-life figure for the Gen3. SONOFF has also certified a motion sensor (SNZT-03P, [August 11](https://on.dcl.csa-iot.org/dcl/compliance/compliance-info/4897/357/1/matter)) and a temperature and humidity sensor (SNZT-02B, [October 15](https://on.dcl.csa-iot.org/dcl/compliance/compliance-info/4897/369/1/matter)) for Matter over Thread. Neither is in SONOFF's store yet, though SONOFF has posted a [user manual](https://support.sonoff.tech/snzt-03p-usermanual-2/) for the motion sensor, which switches between Thread and Zigbee like the door sensor. Neither has a price or on-sale date.