"This Kidde 0914UK is a compact and basic smoke alarm for protection to the family and home. The Kidde 0914UK is easy to install; it has a sealed-in power source so this will reduce user-maintenance; and it has a test button to check battery and alarm operation. Also fitted to the Kidde 0914UK is a red LED to indicate unit power is on. This great safety device comes with a 3 year alarm warranty and is BSI kitemarked. The 0914UK is supplied with a powerful long life 9 Volt Battery as standard. Kidde recommend that Ionisation alarms are quicker at detecting fast flaming fires. * * Kidde also recommends that for maximum protection that both ionisation and photoelectric smoke alarms be installed."