SONOFF SNZB-04 – Zigbee Wireless door/window sensor


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【Sync Status & History Records Check】Sync the opening & closing status of door/window. With 3-month history records check, help you master your home security clearly.
【Smart Scenes, Work With WiFi Devices】Simply connect the sensor with your devices, turn on/off the lights when you open/close the door.
【Voice Control & Camera Binding】Want to check your door/window close or not? Just ask your Alexa/ Google Assistant instead of opening your phone. You can also add a camera to the sensor to scare the stranger off with your voice.
【Easy Installation & Low-battery Notification】Using 3M adhesive to easily mount the sensor at your ideal locations. Replace the battery in time with a notification when the battery life is 10% remaining.
【Note】Zigbee Bridge and batteries are required. Keep a distance of less than 80M between SNZB-04 and Zigbee Bridge (open space).

Frequently Bought Together
SONOFF Zigbee Smart Plug| iPlug Series S40 Lite
Plug Type
SONOFF SwitchMan Smart Wall Switch-M5
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Scene Linkage, Start Your Smarter Life

Have you ever thought to turn on/off home appliance through you action? Simply connect the sensor with your home appliance and you can make devices on/off when you open or close the door.Just Like A Police Is Patrolling Your Home

Worry that your home is threatened when you’re away? Try to connect a camera to the sensor and you can scare the stranger off with your voice anywhere, anytime.

History Records Check

Want to check the past message notification of your home? The motion sensor allows you to go back to the history records over past 3 months.
Intelligent Security, Simple Installation

Simply use our included 3M adhesives to get the motion sensor mounted in your ideal locations just in seconds.

Low-battery Notification

You will get a notification of low-battery level when the battery life gets 10% remaining.

SONOFF SNZB-04 Zigbee Smart Door Window Sensor Mini Door Alarm Sensor Work With SONOFF Zigbee Bridge For Smart Home Security

Note 1: SNZB04 must be used with Zigbee Bridge.

The wireless door/window sensor is essential for knowing who is coming in and out of your home, so it is most often used as part of smart security system.

SONOFF SNZB-04 is a Zigbee two-in-one wireless door/window sensor that can be put on your door or window to tell you with an alert notification if your door or window is opened or closed, adding an extra layer of security to your home. The sensor provides you the possibility to create a scene linkage of Zigbee and Wi-Fi devices. Both the opening and closing status of the door/window are synced on your mobile phone, no longer to think back whether the door/down is off or not. It is really useful and can help you turn on or off the light in the action. Works with SONOFF ZBBridge in harmony, you can set a scene to get your hallway lighted immediately when the door is opened.

The camera function can be enabled on the sensor page in the eWeLink APP, which also allows you to view clearly who enters your home; even you can frighten the stranger and ask him to leave your home immediately with the two-way audio function. Its application can also extend to wide areas like drawers, garage doors, blinds, etc. Just stick it anywhere two things connect and it is always safe even if you don’t keep watch on it. Share the sensor with your family to give them an ability to quickly control and monitor your home together. Simple installation for easier setup. Peel and directly stick it on the targeted place or object, a smart security system is ready for you.



Additional information

Weight 26 g
Dimensions 45 × 19 × 49 mm

Product Type

ZigBee Wireless door/window sensor



Wireless connection





Magnet: 32X15.6X13mm;
Sensor: 47X27X13.5mm

Certified Compliance


Works With


Customer Reviews

Based on 15 reviews
Door contact

Definitely recommended. A great product, especially for the price,

Genadijus Kirilovas

Sonoff turiu labai daug skirtingu produktu ir kaina gera ir kokybe

Frequent disconnects

Really love the design, but the devices frequently disconnect from my network. I am using the CC2531 for my mesh and 2 of these sensors on closets. This means that both are close to routers (the bulbs). Regardless, they are frequently reported as unavailable.

Very good

Got these to replace my wifi door contacts, half the price when bought directly rather than on Amazon.

The supplied batteries won’t last the 2 years as advertised so get a good quality replacements ready.

I also changed the antenna so that it can be put in a more central location
Works well with home assistant, though setup can be a bit troublesome

If you get issues with sensors not updating try changing the battery first before you go re-pairing

Good product

A great product, especially for the price, definitely recommended

good price | guter Preis

Sensor works like expected.
Low price.
But battery compartement not good. Holder gets bend while removing battery. Coompartement of "SONOFF SNZB-02 - ZigBee Temperature and Humidity Sensor" is way better.

Der Sensor erfüllt seine Aufgabe.
Preis ist niedrig.
Aber er hat ein ungünstiges Batteriefach. Beim Entnehmen der Batterie wird der Halter verbogen. Das Fach vom "SONOFF SNZB-02 - ZigBee Temperature and Humidity Sensor" ist deutlich besser.

Luciano Butera
Ottimi prodotti

Funzionamento impeccabile e durata batteria

Good sensors

Good contact sensors, especially for the price. Only complaint is the side with the magnet is a bit too large to fit on a window when placed in the middle. I popped it open and just hot glued the magnet in place, but it'd be great if the plastic box was just thinner

Tarver Snedecor
Dead battery

Seemed to work well. However, battery died within 2 weeks.

Sorry for the inconvenience, our customer service team will contact you to help you solve this issue.

Tim Rock
Efficient magnet sensors

They are small and blend in with our white trim. So far they have been working well with Home Assistant and my Zigbee bridge. They connected immediately to the system.

SONOFF SNZB-04 - Zigbee Wireless door/window sensor
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