A smoke detector can save lives! These smoke alarms from Smartwares provide additional security for you, your family and your property. Each detector has a 3 V lithium battery for 5 years of operation. The smoke alarm detects smoke in your interior at an early stage and warns you of possible dangers, avoiding financial damage with a loud and penetrating alarm signal of 85 dB. It is equipped with low battery indication with an optical and acoustic signal. The smoke alarm should be tested on a regular basis with the testing button to assure that it is well-functioning when a fire occurs. Note: Do not use cleaning products or paint the smoke alarm.