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#16 in Home Automation & Smart Home
SONOFF SenseGuard SNZB-04PR2 — Zigbee Door/Window Sensor (4-Pack)
Home Automation & Smart Home

SONOFF SenseGuard SNZB-04PR2 — Zigbee Door/Window Sensor (4-Pack)

4.1(234 reviews)

$39.90reference price

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Best for

Anyone who already has or is going to buy the Zigbee coordinator in this catalog and wants to monitor several doors/windows at once — it comes in a 4-pack, not individually.

  • Zigbee
  • 4-pack
  • Requires hub

What is it and what's it for?

It's a contact sensor that detects whether a door or window is open or closed, and alerts your phone in real time — useful both for security (someone opened it without you knowing) and automation (for example, turning off the AC if a window is left open).

Real-world use cases

At home

You install it on the front door or a window that tends to get left open by accident, and set up a phone alert or an automation (like turning off the AC) if it stays open for more than X minutes.

In a business or workshop

A store can monitor storage room doors or secondary entrances after hours, getting an immediate alert if someone opens them when there shouldn't be any activity.

How to avoid buying the wrong one

  • It needs a Zigbee hub or coordinator to work — it integrates directly with this catalog's SONOFF coordinator for Home Assistant, or with a compatible hub for Alexa/SmartThings.
  • It comes in a 4-pack, not individually — think of it as covering several doors/windows in one purchase, not as a single sensor.
  • It has tamper-alert on top of open/close detection — it warns you if someone tries to remove the sensor from its spot, not just if the door opens.

The investment takeaway

At $39.90 for 4 units (~$10 each), it's a cheap add-on for anyone who's already invested in this catalog's Zigbee coordinator — you add security and automation across several openings without paying for another brand's closed system.

SONOFF SenseGuard SNZB-04PR2 — Zigbee Door/Window Sensor (4-Pack)

$39.90reference price

See current price on Amazon

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