🔥 Reliable and Long-lasting SITERWELL Smoke Detector, 10-Year Fire Alarm with Photoelectric Technology, Low Battery Warning and Silence Function - UL217 and GS508 Approved (2 Packs) Review

【Activation Before Installation】Press test button and hold it for more than 3 seconds until LED lights, and release it within 2 seconds, smoke detector will generate a “beep” indicating that it is successfully activated. Smoke alarm won't work if activation fails. 【Test/Silence Button】 The smoke alarms design the test function by pressing the test button, used to test the product is working normal. A weekly test is required. In order not to disturb your rest, the product designs function of silence and no disturb. 【Easy Installation & High Quality】The fire detector can easily install with mounting bracket. It's easily to install on wall or ceiling. Our products are UL certified, you can rest assured and have absolute trust in our products. 【10 Years of Life】The smoke alarm has built-in 3V lithium battery which battery operated 10 year ​and warns you when the battery is low. When the alarm send a fault signal, you must replace the product immediately. 【Photoelectric Technology】The smoke alarm pack has photoelectric technology, it's more sensitive to detecting slow smolder fires which general thick, black smoke and may smolder for hours before bursting into flames.