Carbon Monoxide Detector Plug in sells on Amazon. I think the price is very good. Please read some of the reviews and see people thought of the product.**If you’re not sure whether to buy, add to cart, and you can come back to it later!**

Plug-in 3-in-1 CO MonitorPlugs directly into any outlet no batteries needed. Monitors carbon monoxide, temperature, and humidity simultaneously. A reliable carbon monoxide detector for peace of mind. Color Display with Digital ReadoutLarge digital display shows carbon monoxide levels, temperature, and humidity readable from 15 feet away. Clear temp humidity indicators with colorcoded alerts.