Kidde brand deluxe carbon monoxide detector and alarm c/w digital display. This product plugs in directly into an AC outlet or wall mount with AC extension or on a table top with AC extension. The alarm has a 9V battery back up and battery is included. The digital display provides a constant readout of CO particles in the area. Ideal for areas that are serviced and combust gasoline (garage) or natural gas appliances (fireplace, BBQ, hot water tank, furnace). This item available on Amazon for more than $50. This item is brand new in the box.