10 YEAR SEALED LITHIUM BATTERY: Powered by a sealed long-life lithium battery designed to last the full lifespan of the alarm, eliminating the need for battery replacements. EASY INSTALLATION & OPERATION: Quick and simple installation with automatic battery activation on base plate fitting. Large central test and silence button for convenient operation. END OF LIFE INDICATION: Built-in End of Life warning alerts when the unit needs replacing, ensuring continuous protection and peace of mind. CERTIFIED & RELIABLE PROTECTION: Meets BS EN14604 standards with an 85dB alarm sound level. Suitable for bedrooms, hallways and living areas in domestic properties., Weight: 0.3527396192 Pounds, Manufacturer: Fire Angel Limited