The Kidde K10LLCO Carbon Monoxide Detector is a reliable and essential home security device powered by a built in non replaceable lithium battery. With a sleek white design and an operating sound rating of 85 dB, this unit includes everything you need for peace of mind. Manufactured by Kidde, a trusted brand in home safety, this carbon monoxide detector is equipped with an electrochemical sensor and comes with a 10-year manufacturer warranty. Perfect for households looking to safeguard their living space against potential carbon monoxide hazards. This batch that I have was manufactured September 2024, brand new, un-opened and in good working order. There is more stock over on seller 11ms23 which is my Son Matthew.