SITERWELL Smoke Detector Fire Alarm with Magnetic Fastening Kit and Built-in Battery, Fire Safety with Photoelectric Technology for Home Bedroom and Babyroom, UL Listed, GS528A, 3 Packs

【Certified Safe】The smoke detector has passed UL certification, product quality is guaranteed. The smoke alarm don’t contain any radioactive material and won’t cause harm to human’s body
【Humanized Design】Loud>85dB makes everyone in the house can hear the alarm clearly when the smoke alarm is chirping. If low battery there will be a signal alarm, which informs you to change a new battery
【Test Button】The smoke detector is easy to test by pressing the button for more than 5 seconds. Don’t test by open fire, it will damage the alarm or ignite combustible materials and cause structure fire