The CO detector is free-standing, which means it can be placed on a tabletop or mounted , easy to take while traveling. Portable design makes it easy to take while traveling. This CO alarm is equipped with reliable and long-lasting sensors that 10 years of stable performance, keeping your home and family safe for a decade. Advanced electrochemical CO sensor provides high accuracy alarm. An early warning will be delivered through a loud 85-decibel alarm. LCD allows you to see any changes in CO levels and battery status; to save power, it will only activate when tested, or if the CO reaches a certain level for a certain period of time. 3-colored LED indicators clearly inform you the working status of the alarm. Green LED indicates normal. Red LED indicates alarm. Yellow LED indicates failure. color: White Material: ABS Package Contents: 1 pcs smoke alarm Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.