🚪 SONOFF SenseGuard DW Gen2 — Zigbee Door & Window Sensor (SNZB-04PR2)
The Gen2 upgrade of SONOFF's popular door/window sensor. The SNZB-04PR2 features built-in tamper detection, standard AAA batteries (no more expensive coin cells), a 30mm detection range, and a slimmer profile at just 45.1g. Instant push notifications via eWeLink when any door, window, gate, or drawer is opened. Create powerful security automations — trigger cameras, sirens, lights, and HVAC automatically. Works with eWeLink, Alexa, Google Home, and Home Assistant. MPN: SNZB-04PR2.
🔄 Looking for the original SNZB-04P?
The SNZB-04P uses a CR2477 coin cell and has a 22mm detection range. If you prefer the original model or need a more budget-friendly option:
⚡ Key Features
- Tamper Alert Detection — built-in tamper sensor detects forced removal or damage; sends instant app alerts and can trigger smart scenes like gateway sound alarms
- 30mm Detection Range — works with wide gaps when mounted horizontally; 15mm range in vertical mount position
- Standard AAA Batteries — powered by 2× AAA (LR03) batteries, no expensive coin cells; up to 3 years of operation
- Instant Open/Close Notifications — magnetic reed switch triggers within milliseconds; push notification via eWeLink app
- Open/Close History Log — eWeLink records every event with timestamps; review when doors were opened and closed
- Ultra-Slim & Lightweight — only 45.1g including batteries; compact 90×26×13.5mm transmitter blends into any door or window frame
- Flexible Mounting — horizontal and vertical install options with detachable magnet for tight or unconventional spots
- Smart Scenes & Automations — trigger lights, cameras, alarms, HVAC, or notifications when a door opens; create "if door open for X minutes → send alert" automations
- Energy Saving — auto-off thermostat or lights when a door or window stays open too long
- Zigbee 3.0 (TLSR8656F512ET32) — 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, and tamper entities
🏠 Perfect For
Front Door & Entry Points
Get notified 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 & HVAC
Open the pantry door → lights turn on. Leave a window open too long → thermostat turns off to save energy. Hands-free automation.
Safety Gates, Cabinets & More
Monitor baby gates, pet doors, medicine cabinets, gun safes, fridges, or drawers. The tamper alert adds an extra layer if someone tries to remove the sensor.
🔧 Three Ways to Install
Horizontal Mount (30mm range)
Standard side-by-side placement on the door frame and door. Works great with wide gaps. 3M adhesive included — peel and stick.
Vertical Mount (15mm range)
Ideal for doors and frames with height differences. Magnet sits on top of the door, sensor on the frame above.
Detachable Magnet
The magnet can be removed from its holder and placed separately — perfect for tight or unconventional spots where a standard mount won't fit.
📡 Compatible Zigbee Hubs
The SNZB-04PR2 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 →🔄 SNZB-04PR2 vs SNZB-04P — What's New?
| Feature | SNZB-04PR2 (Gen2) ✨ | SNZB-04P |
| Battery | 2× AAA (LR03) — cheap & easy | CR2477 coin cell |
| Battery Life | Up to 3 years | Up to 3 years |
| Detection Range | 30mm horizontal / 15mm vertical | ≤ 22mm |
| Tamper Detection | Yes ✓ | Yes ✓ |
| Vertical Mount | Yes — dedicated vertical magnet option | No |
| Detachable Magnet | Yes ✓ | No |
| Weight | 45.1g | ~34g |
| Transmitter Size | 90 × 26 × 13.5mm | 47 × 27 × 13.5mm |
| MCU | TLSR8656F512ET32 | CC2652P |
| Price | R 380.00 | R 245.00 |
Which one should I choose?
Choose the SNZB-04PR2 (Gen2) if you want the latest model with AAA batteries (cheaper to replace), a wider 30mm detection range, and flexible vertical/detachable mounting options.
Choose the SNZB-04P if you want a more compact sensor at a lower price point and are happy with a CR2477 coin cell battery.
📋 Technical Specifications
| Product Name | SenseGuard DW Gen2 |
| MPN / Model | SNZB-04PR2 |
| Protocol | Zigbee 3.0 (IEEE 802.15.4) |
| MCU | TLSR8656F512ET32 |
| Detection Type | Magnetic reed switch (open / close) |
| Detection Range | 30mm (horizontal) / 15mm (vertical) |
| Tamper Alert | Yes — detects forced removal or damage |
| History Log | Yes — timestamped open/close events in eWeLink |
| Input | 3V⎓ |
| Battery | 2× AAA (LR03) — up to 3 years life |
| Low Battery Alert | Yes — push notification via eWeLink |
| Hub Required | Yes — ZB Bridge-P, NSPanel Pro, ZB Bridge-U, iHost, ZBDongle-E/P |
| Home Assistant | ZHA · Zigbee2MQTT — contact, battery, tamper entities |
| Voice Control | Amazon Alexa · Google Assistant (via hub) |
| Apple Home | Yes — via Matter Bridge (ZBBridge-U, iHost, CUBE OS) |
| App | eWeLink (iOS & Android) |
| Transmitter Size | 90 × 26 × 13.5mm |
| Magnet Size | 31 × 14 × 6.5mm |
| Net Weight | 45.1g (incl. batteries) |
| Casing Material | PC (Polycarbonate) |
| Operating Temp | -10°C to +60°C |
| Operating Humidity | 5% – 95% RH, non-condensing |
| Mounting | 3M adhesive tape (included) |
| Included | 1× Transmitter · 1× Magnet · 2× AAA batteries · 3M adhesive pads · Quick start guide |
| Warranty | 1 Year Manufacturer Warranty |
❓ Frequently Asked Questions
Does this work without a hub?
What batteries does it use?
Can I use it on a sliding door or gate?
What's the tamper alert?
Does it work with Home Assistant?
How does it compare to the SNZB-04P?
Does it work with Apple HomeKit?
Does Eiferer offer local warranty?
🤝 Need Help? We're Here for You!
Visit Us
8 Wildebraam Street
Weltevreden Park, Roodepoort
Gauteng, 1709
🛡️ Secure Your Home with SenseGuard DW Gen2
Tamper detection · AAA battery · 30mm range · Zigbee 3.0
