【Pre-Linked for Easy Setup】: No complicated installation required - simply power on, test, and fit in seconds! The bundle comes pre-linked for your convenience, making installation a breeze. 【10 Years Battery Life】: With a built-in 10-year lithium battery, you won't need to worry about frequent battery changes. Enjoy 24/7 protection, even during power cuts. 【Split-Spectrum Technology】: Utilizing the latest spilit spectrum technology, our smoke alarms are much more accurate and react faster than conventional sensors. Our heat alarms instantly activate when the ambient temperature exceeds the safe limit. 【Wireless Networked Alarms】：All alarms are designed to be wirelessly linked. If any single alarm triggers, every alarm will sound in unison, guaranteeing thorough protection for your home. Up to 24pcs alarms to be linked. 【Meeting Safety Regulations】：Our alarms adhere completely to the stringent safety standards required in Scotland and England, specifically BS EN14604:2005 and BS 5446-2:2003. 【 Simple Setup】：Thanks to the included adhesive pads and screws, you can install it quickly and without any fuss. There's no need for specialized tools or an electrician., Weight: 1.0582188576 pounds, Manufacturer: Zhejiang Huaxiao Technology Co., Ltd