PRODUCT GRADING (Grade C) - Fair Condition > Visible scratches and signs of use throughout > Refurbished to the highest standards. Retail Box WHAT IS IN THE BOX X-Sense 10-Year Battery Combination Smoke Carbon Monoxide Detector Alarm with LCD Display of CO Readings PRODUCT DESCRIPTION Equipped with both photoelectric and electrochemical CO sensors that work independently of each other; instantly notifies you when dangerous smoke or CO concentration is detected while minimizing false alarms; provides the ultimate protection from 2 deadly threats, all contained in 1 unit BUILT-IN 10-YEAR BATTERY Provides 10 years of continuous power with a built-in lithium battery, saving on energy while remaining eco-friendly; saves you from constantly having to change batteries or wonder if your alarm is still functioning ACCURATE, RELIABLE & HIGHLY SENSITIVE The X-Sense combination smoke and co alarm has been redesigned from the inside out; it will ensure that smoke triggers the alarm instead of interference by taking 3 separate smoke samples from the surrounding air; a full 360 ° ring of air intakes ensures complete detection with no blind spots LED INDICATOR Clearly informs you of the working status of the alarm with its 3-color flashing LED indicator (green LED indicates normal operation, red LED indicates the alarm status, and yellow LED indicates a fault), ensuring the safety and security of your home 24/7 LARGE LCD DISPLAY Clearly displays battery level and the real-time CO levels in PPM (parts per million) taken from the surrounding air, with an updated measurement taken every 10 seconds PRODUCT INFORMATION Brand - X-Sense Power Source - Battery Powered Colour - White Item dimensions - L x W x H 14.6 x 14.6 x 5.1 centimetres Alarm - Audible Sensor type - Photoelectric, Electrochemical