Ecoey Smoke Detector Interconnected, Wireless Fire Alarm with Built-in Lithium Battery, 10-Year Fire Safety with Silence Function and Low Battery Warning, FJ111-2 Pack

HOW TO TEST: Don’t test smoke detector by the usage of burning paper or match. Test if your smoke detector were connected successfully by pressing the test button of a random device until it beeps. Right through the test，the red LED of all conncted devices will flash twice per second for five minutes(the connected devices will not beep, only the LED will flash)
WIRELESS INTERCONNECTED: This smoke alarm can realize the interconnection between same models. When fire detector detects smoke and the alarm sounds, other alarms connected to it’s going to all sound. Up to 40 pcs alarms interconnect, wireless range is 328 feet
10 YEARS LIFE: This fire alarm has a built-in 3V lithium battery, it ensures 10 years lifetime without replacing the battery. Smoke detector has a low battery warning for you to remind you to change smoke detector
SILENCE FUNCTION: If non-emergency smoke (e.g., cooking fumes) causes nuisance alerts, you’ll be able to easily silence them by pressing the test/silence button of smoke alarm, false alarms will also be cancelled with a single tap. Mute can last as long as ten minutes
24 HOURS PROTECT : When you have problem in smoke alarms interconnection, please contact us. Smoke detectors must be installed in every room (excluding bathrooms and kitchens). Don’t test smoke detector with cigarette or burning paper, sensor will be damaged