SONOFF Zigbee DW Gen2 — Zigbee Door & Window Sensor (SNZB-04PR2)

SONOFF Zigbee DW Gen2 — Zigbee Door & Window Sensor (SNZB-04PR2)

Upgrade your smart home security and automation with the SONOFF Zigbee DW Gen2 (SNZB-04PR2), a slim, reliable Zigbee door and window contact sensor designed for real-world installations.

This second-generation sensor detects open/close status instantly and includes built-in tamper detection. When the sensor is removed or interfered with, it triggers immediate alerts and can activate smart scenes — ideal for security systems, Home Assistant automations, and everyday convenience.

Key Features

• Ultra-slim & discreet design — Sensor body only ~13.5–14 mm thick with a thin magnet (6.5 mm). Blends cleanly into door and window frames without looking bulky.
• Flexible installation — Supports horizontal mounting (up to 30 mm detection gap — great for older doors/windows with wider gaps) and vertical mounting (up to 15 mm). The magnet is detachable for tight or awkward spaces.
• Long-lasting power — Runs on 2 × standard AAA batteries with up to 3 years of battery life under normal use. Easy and cheap to replace.
• Tamper protection — Built-in rear tamper switch detects removal and sends instant notifications or triggers alarms/scenes.
• Reliable Zigbee connectivity — Low-power, stable Zigbee (IEEE 802.15.4) for local control and mesh networking.
• Versatile monitoring — Perfect for external doors, windows, cabinets, drawers, refrigerators, medicine cabinets, gun safes, and more.

Perfect for Home Assistant & Smart Homes

Works excellently with Home Assistant via Zigbee2MQTT or ZHA, as well as SONOFF Zigbee hubs (ZBBridge, NSPanel Pro, iHost, Dongle series), SmartThings, Alexa, Google Home, and eWeLink (via compatible gateway). Use it to:

• Trigger lights, cameras, or sirens when a door/window opens
• Get alerts if something is left open
• Create energy-saving automations (e.g. turn off AC/heating if windows are open)
• Add an extra layer of security with tamper alerts

Technical Specifications

• Model: SNZB-04PR2
• Protocol: Zigbee
• Power: 2 × AAA (LR03) batteries
• Battery life: Up to 3 years
• Detection gap: Up to 30 mm (horizontal) / 15 mm (vertical)
• Dimensions: Transmitter 90 × 26 × 13.5 mm | Magnet 31 × 14 × 6.5 mm
• Weight: 45.1 g (including batteries)
• Operating temperature: -10°C to 60°C
• Humidity: 5–95% RH (non-condensing)
• Colour: White
• Indoor use only

Requires a Zigbee hub/coordinator (not included). No Wi-Fi or Bluetooth — pure Zigbee for better reliability and local control.

Ideal for South African homes dealing with security needs, load-shedding-aware setups, and clean Home Assistant integrations. Slim enough for modern frames yet flexible enough for older properties.

Add reliable open/close and tamper sensing to your smart home today with the SONOFF SenseGuard DW Gen2.