GREENBLUE GB478 Wireless WiFi Door/Window Sensor – Smart Magnetic Contact, Tuya & Gosund App, Alexa/Google, Battery Powered, White

The GREENBLUE GB478 stands out from typical door/window sensors by combining a compact magnetic contact design with direct Wi-Fi connectivity—no separate hub or gateway required. Unlike many entry-level sensors that rely on Zigbee or Z-Wave bridges, the GB478 connects straight to your 2.4 GHz home network, making smart home integration refreshingly simple. Its discreet white ABS housing blends into any door or window frame, while the adhesive mount ensures a tool-free installation in minutes.

Highlights

• Direct Wi-Fi connection (IEEE 802.11 b/g/n, 2.4 GHz) – no hub needed
• Magnetic contact sensor detects open/close with a gap up to 15 mm
• Works with Gosund and Tuya Smart apps for remote monitoring and automation
• Voice control via Amazon Alexa and Google Assistant
• Real-time push notifications and low battery alerts
• Battery powered (CR2 3V lithium, up to 12 months life)
• Supports scene linkage and IFTTT for custom automations
• CE and RoHS certified for safety and environmental compliance

In daily use

Installation is effortless: peel off the adhesive backing, place the sensor on the door or window frame, and align the magnet on the moving part. Once connected to your Wi-Fi through the app, you'll receive instant alerts on your phone whenever the door or window opens or closes. The sensor's low power consumption ensures months of maintenance-free operation, and when the battery runs low, the app notifies you well in advance. Use it to trigger lights, cameras, or other smart devices via scene linkage, or create custom routines with IFTTT for a truly personalized smart home experience.

Full specifications

• Connectivity Technology: Wi-Fi
• Wi-Fi Standard: IEEE 802.11 b/g/n
• Wi-Fi Frequency: 2.4 GHz
• Sensor Type: Magnetic Contact Sensor
• Detection Method: Door/Window Open/Close
• Power Source: Battery Powered
• Battery Type: CR2 3V Lithium
• Estimated Battery Life: Up to 12 months
• App Compatibility: Gosund App, Tuya Smart App
• Voice Assistant Support: Amazon Alexa, Google Assistant
• Alerts: Real-time Push Notifications
• Automation Features: Scene Linkage, IFTTT support
• Installation Type: Adhesive Mount
• Operating Temperature: -10°C to 50°C
• Operating Humidity: 10% to 90% RH (non-condensing)
• Material: ABS Plastic
• Color: White
• Low Battery Notification: Yes
• Detection Gap: Up to 15 mm
• Certification: CE, RoHS

Final note

The GB478 is the ideal choice for anyone seeking a simple, reliable, and hub-free way to monitor doors and windows, with the flexibility to expand into a full smart home ecosystem.