expiry Sep 2034, this item is brand new however the box is in poor condition due to storage as seen in photos. The item is unaffected as seen in photo. Aico Ei3016 mains powered optical smoke alarms, each with a lithium battery included and a manufacturer warranty of 10 years. These alarms are designed with a battery backup feature and are compatible with smart home systems via Wi-Fi and RF link. The white-coloured alarms are hardwired for power. The batteries have an expiry date of Sep 2034, providing long-lasting security for your home.