This XS01 smoke detector has received TÜV certification. Compact yet powerful, this mini detector packs outstanding performance into an elegant design. The mini smoke alarm has a diameter of only 78 mm, so it can be easily and unobtrusively installed anywhere. Thanks to the built-in 10-year lithium battery, it can protect your home 24/7 for a decade. Its self-check function tests the circuits, electronics, and battery to ensure optimal fire monitoring. Equipped with a low-battery warning, it lets users know when to replace the unit, ensuring uninterrupted protection.