What’s good about it? • Lento 10 is an upgraded version of our classic Lento Smoke alarm • Non-replaceable 10-year Lithium battery • The entire front surface functions as test button • Fast installation with an adhesive tape • Tested and certified in EU • Mounting plate included FEATURES 10 year mounted Lithium battery Automatic power activation upon installation Fast installation with 3M double sided tape or with mounting screws Entire surface functions as a test button Silent function SMOKE SENSING Jalo Helsinki smoke alarms operate with optical smoke detection technology. Optical or photoelectric detection is the most modern, most common and most reliable technology used in the smoke alarms. ALARM SOUND When the alarm detects smoke, it signals it with a loud and continuous warning sound of more than 85 decibels. The smoke alarm also has a false alarm silence function.