🚪 SONOFF SNZB-04P — Zigbee Door & Window Sensor (Battery, Tamper Alert, History Log)
Know instantly when any door, window, gate, or drawer is opened. The SONOFF SNZB-04P is a Zigbee 3.0 magnetic contact sensor that sends an instant push notification to your phone whenever the magnet separates from the sensor body — door opened, window opened, cabinet opened. Features a tamper alert if someone removes the sensor from the wall, plus a history log of every open/close event. Battery lasts up to 3 years on a single CR2477. Works with eWeLink, Alexa, Google Home, and Home Assistant. MPN: SNZB-04P.
✨ New Gen2 Available — SNZB-04PR2
Upgraded with standard AAA batteries (no coin cells), 30mm detection range, vertical mounting, and detachable magnet design.
View SenseGuard DW Gen2 → R 380.00⚡ Key Features
- Instant Open/Close Detection — magnetic reed switch triggers within milliseconds of the magnet separating; instant push notification via eWeLink app
- Tamper Alert — built-in tamper detection notifies you if someone removes the sensor from the mounting surface; adds a layer of security
- Open/Close History Log — the eWeLink app records every event with timestamps; review when doors were opened and closed over the past weeks
- 3 Year Battery Life — powered by a single CR2477 coin cell; low-battery alerts in the app when it's time to replace
- Compact & Discreet — small, modern design fits neatly on any door or window frame; 3M adhesive and screws included
- Smart Scenes & Automations — trigger lights, alarms, cameras, or notifications when a door opens; create "if door open for 5 minutes → send alert" automations
- Zigbee 3.0 (CC2652P) — reliable, low-power mesh networking; acts as a Zigbee end device
- Home Assistant Support — works with ZHA and Zigbee2MQTT for full local control; exposes contact, battery, tamper, and voltage entities
🏠 Perfect For
Front Door & Entry Points
Get a notification every time your front door, back door, or garage side door is opened. Review the history log to see who came and went throughout the day.
Window Security
Mount on windows throughout the house. Create a scene: "If any window opens after 10 PM → turn on alarm siren and send push notification."
Automatic Lights
Open the pantry door → lights turn on. Close the door → lights turn off. Pair with any SONOFF Zigbee smart switch for hands-free lighting.
Cabinets & Safes
Monitor medicine cabinets, liquor cabinets, gun safes, or filing cabinets. The tamper alert adds an extra layer if someone tries to remove the sensor.
📡 Compatible Zigbee Hubs
The SNZB-04P requires a Zigbee 3.0 hub. Here are the hubs we stock:
SONOFF ZB Bridge-P
Affordable Zigbee-to-WiFi gateway. Supports up to 128 Zigbee devices via eWeLink. The easiest way to get started with Zigbee sensors.
View Product →SONOFF NSPanel Pro
Wall-mounted touchscreen with built-in Zigbee hub, intercom, and dashboard. Manage all your Zigbee sensors from one screen.
View Product →SONOFF ZBDongle-Max
Long-range USB Zigbee coordinator with external antenna and 2.5× range. Ideal for large homes or outdoor Zigbee networks with Home Assistant.
View Product →SONOFF ZBDongle-E
USB Zigbee coordinator for Home Assistant (ZHA / Zigbee2MQTT). Full local control without cloud. Plug into a Raspberry Pi or PC.
View Product →🔄 Also Consider: SenseGuard DW Gen2
📋 Technical Specifications
| Product | SONOFF Zigbee Door & Window Sensor |
| MPN / Model | SNZB-04P |
| Protocol | Zigbee 3.0 (CC2652P) |
| Detection Type | Magnetic reed switch (open / close) |
| Tamper Alert | Yes — detects removal from surface |
| History Log | Yes — timestamped open/close events in eWeLink app |
| Battery | CR2477 (3V) — up to 3 years life |
| Low Battery Alert | Yes — push notification via eWeLink |
| Max Magnet Gap | ≤ 22 mm (sensor to magnet) |
| Hub Required | Yes — NSPanel Pro, ZB Bridge-P, ZB Bridge-U, iHost, ZBDongle-E/P, Echo Plus 2nd |
| Home Assistant | ZHA · Zigbee2MQTT — contact, battery, tamper, voltage |
| Voice Control | Amazon Alexa · Google Assistant (via hub) |
| App | eWeLink (iOS & Android) |
| Operating Temp | -10°C to +60°C |
| Mounting | 3M adhesive tape (included) or screws (included) |
| Included | 1 × Sensor body · 1 × Magnet · 1 × CR2477 battery (pre-installed) · 3M tape · Screws · Manual |
| Warranty | 1 Year Manufacturer Warranty |
❓ Frequently Asked Questions
Does this work without a hub?
Can I use it on a sliding door or gate?
How do I get notified when a door opens?
What's the tamper alert?
Does it work with Home Assistant?
How long does the battery last?
What's the difference between the SNZB-04P and the new SNZB-04PR2?
🤝 Need Help? We're Here for You!
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8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709