Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! 2 In 1: Our carbon monoxide detectors have 2 in 1 functionality. Not only detect carbon monoxide, but as smoke detectors. This dual functionality eliminates the need for multiple devices, saving you time, money, and space. Accurate Detection:The carbon monoxide detector is equipped with dual high stability sensors for greater sensitivity and accuracy, ensuring that any potential threats are detected in a timely manner. LCD Screen:The LCD screen provides clear and easy-to-read information, allowing for quick and convenient monitoring of carbon monoxide levels. 85db in Alarm: With an alarm, our Carbon Monoxide Detectors provide a loud and clear warning signal in case of any potential danger. This ensures that you and your loved are alerted promptly in case of an emergency. Battery type: 3*AA batteries (not included) Style: B Material: plastic colour: White Package