[2 in 1 detector]: It can as both smoke detector and carbon monoxide detector to detect the threat from these two harmful chemicals. One single unit instead of two saves your money and home space for installation performs equally and even better. [Digital display & sound-light alarm]: When the fire smoke alarm detects a smoke fire or detected concentration of carbon monoxide exceeds the standard value, the LCD display will show the current value of the concentration, meanwhile emit an alarm sound of 80 decibels, and the ring light flashes ! [Easy to install& battery powered]: The smoke and carbon monoxide detector requires no wiring so you can install it in mintues without electricians or anywhere ! Powered by three 1.5V AA batteries(without battery), the detector continuously monitors carbon monoxide and smoke levels even in the event of a power failure, keeping you and your family safe! [High accuratel sensor]: Smoke detectors using high accurate electrochemical sensor, alerts you to carbon monoxide danger and insure the safety of your life. Photoelectric sensor is also equipped to detect smoke accurately while minimizing alarms Colour: white Material: ABS Size: 104 x 39mm Package Contents: 1 x smoke co detector 1 x English Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.