Fireguard Photoelectric Smoke Alarm SKU: 323940 MODEL: 141821 Error. try again later You've successfully joined the club $ 18 each Mitre 10 Variants Includes FireGuard alarm, mounting bracket and screws, user instructions. 10 Year. Features and benefits Photoelectric Sensor. Hush/Test button. Loud warning tone 85db. Low battery warning. Sealed lithium battery. Easily Installed.