About this item 【Upgraded Dual Sensors to Ensure Your Safety】: Compared with most carbon monoxide smoke detectors on the market, our detector sensors have a lifespan of up to 10 years, while other detectors on the market only use three-years life sensors, so our products have a longer service life. The combined smoke and carbon monoxide detector uses a photoelectric smoke sensor and an electrochemical sensor to detect smoke and carbon monoxide faster and more accurately, protecting your home from two potentially deadly threats. 【WirelessI Interlinked Alarms&Easy to Use】: All Alarms wirelessly interlink with each other. The products are pre-configured and can be used directly. The instructions also provide detailed steps to help you easily set up the product. When the product detects gas, all alarms will sound off together. This ensures all areas of your home are protected and all occupants are notified during an emergency. Our interconnected alarm system creates a ‘Mesh’ style network where each alarm is connected to all other alarms. This Mesh network provides more stable and reliable wireless performance and a greater coverage range of up to 250m(820 ft) compared to other detectors. 【Battery-Operated&Easy Installation】:This CO alarm is powered by large capacity 3x1.5V AA batteries (included), and this combination smoke and carbon monoxide detector can be easily installed using the included mounting bracket, screws, and anchors. The detector's battery life is up to five years, and we also provide a lifetime free battery and product replacement service to save you money. 【LCD Digital Displays & Multi-directional Sensing Hole】: The informative LCD will show you the battery level and real-time CO levels in PPM (parts per million). If there is fire and carbon monoxide with a concentration over 0.1% db/m, the blue light flashes rapidly. If CO is detected, the red light will flash. Dense gas-sensing holes can prevent alarms from causing false alarms and reduce your worries. 【Safety Guarantee and High Quality】: This product has passed the UL standard report issued by the laboratory accredited by ILAC ISO 17025/NRTL standard. We have complete certificates of UL217 and UL2034 testing. Protect yourself and your family from the silent danger of carbon monoxide with our top-of-the-line Carbon Monoxide Detectors. With its advanced detection capabilities, our Carbon Monoxide Detectors offer you an added layer of security and peace of mind. If you have any questions about Kesymo smoke and carbon monoxide detectors, please feel free to contact the Kesymo team, we will provide you with a Lifetime free after-sales service. › See more product details