The Kupu 10 Smoke Alarm in Chrome by Harri Koskinen is sleek and organic with a metallic surface giving a modern look allowing you to complete your interior design in style. The fixed Lithium battery will last the 10 year lifetime of the product, all smoke alarms should be replaced every 10 years regardless.The alarm uses photoelectric detection technology to sense smoke from different types of fires. It is equipped with a self-diagnostic and checking feature to ensure correct operation throughout its life and emits a loud, continuous warning siren when it senses smoke.All Jalo Helsinki Smoke alarms are fully tested and certified in EU.