A smoke detector can save lives! The smoke detector RM L 3100 from Brennenstuhl provides more security for you, your family and your property. The detector has a built-in 3 V lithium battery for permanent functional reliability. The smoke alarm detects smoke in your interior at an early stage and warns you in good time of possible dangers and financial damage with a loud, penetrating alarm signal of 85 dB. It is equipped with low battery indication with an optical and acoustic signal. Note: Please activate the smoke alarm device before installation.