Features: Safeguards your home with our advanced smoke and carbon monoxide alarm. Our alarm features precise sensors for accurate detection of both carbon monoxide and smoke, providing reliable monitoring. Designed for families, this alarm is essential for protecting your loved ones from potential hazards. Suitable for various indoor environments such as corridors and hallways, our alarm provides peace of mind and timely alerts. Trust in the durability and stability of our high quality alarm, which is easy to install and operate. Specifications: Material:ABS Color:White Size:Approx.104x39mm/4.09x1.53inch Working voltage: 4.5V Alarm current: 30mA Detection angle: 360. Detection distance: 20~30m Transmitting frequency433MHZ Battery: 3x1.5V AA battery (not included) Alarm voice: light/sound prompt Sensors: electrochemical carbon monoxide sensors and infrareds photoelectric sensors. Temperature: 0℃~50℃ Relative humidity: 10-95% Alarm prompt: 1cd display, light/sound prompt. Installation method: wall-mounted Package Includes: 1x Smoke Detector note: ①.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. ②.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings.