Combination smoke and carbon monoxide detector with digital display and audible and visual alarm, 2-in-1 battery-operated smoke and CO detector for home, travel, or

General Description: The combined smoke and carbon monoxide (CO) detector is designed to protect your home from two potentially deadly threats. Using a photoelectric smoke sensor and an electrochemical CO sensor, it detects both smoke and carbon monoxide quickly and accurately. Technical Specifications: High-precision electrochemical sensor for CO; Infrared photoelectric sensor for smoke detection; Audible alarm of ≧ 85 dB; Operates on 3 x 1.5V AA batteries (not included); Ultra-long standby time with low power consumption. Installation: Easy to install, simply: Drill the two marked mounting holes; Hammer the plastic eyelets into the holes; Mount the bracket to the ceiling by inserting and tightening the provided screws. Tip: Install the sirens 0.3 to 1 m below the ceiling for optimal detection. Operation: After installing the batteries, the detector will emit a "beep" sound and begin normal operation after 2 minutes. The LED indicators show: Green: normal operation; Red: smoke detection; Blue: carbon monoxide detection; Other information