Overview 4-in-1 Detection: Simultaneously monitors gas, carbon monoxide, and other hazards for comprehensive safety. Certification Compliance: Meets European and American safety standards for reliable performance. Audible and Visual Alarm: Provides clear alerts through sound and light for immediate hazard awareness. Wireless Communication: Easy installation with no wiring required, suitable for various environments. Wide Application: Ideal for homes, hotels, and industrial settings like coal mines. Specifications Working Voltage: AC 110-240V Alarm Current: 150mA Static Current: 450mA Detection Angle: 360 degrees Detection Distance: 30-50 meters Transmission Frequency: 433MHz Weight: 139 grams Working Temperature: 0~50�C Installation Method: Wall-mounted Color Options: Charming Black, Pearl White Model Variants: US Standard, European Standard, Upgraded Color Screen versions Packing List 4-in-1 Gas Carbon Monoxide Alarm Detector*1 Mounting Bracket*1 User Manual*1 Screw Pack*1