vDoor and Window Monitoring: Automatically turns lights on when a door is opened and triggers sound and light alarms for unauthorized entry, while sending app notifications to keep you informed at all times Tamper Alert: Equipped with tamper detection to provide peace of mind. If the sensor is tampered with, you'll receive an alert notification on your phone 5-Year Battery Life: Powered by a CR2477 battery, it offers a long-lasting battery life of over 5 years, reducing the need for frequent replacements Zigbee 3.0 Compatibility: Seamlessly integrates with Zigbee hubs that use Zigbee 2.0 protocol, such as SONOFF NSPanel Pro, SONOFF iHost, SONOFF ZB Bridge Pro, SONOFF ZBDongle-E, and Echo Plus 2nd Local Smart Scenes: With local smart scene capabilities, even if your internet connection goes down, as long as your Zigbee devices are powered, scene linkage between devices will still work Specifications: Model: SNZB-04P Wireless connection: Zigbee 3.0 Installation distance: ≤20mm Working humidity: 5-95%RH, non-condensing Casing material: PC Net weight: 33g Battery model: CR2477 (3V) Working temperature: -10℃~60℃ Product dimension: Transmitter: 50.5x32x21.9mm, Magnet: 27x12x12.4mm