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Product Introduction: Wireless mode: Alarm Transmission frequency RF433MHz or RF868MHz independent (Can be chose as your requirement) . Main Feature: When an alarm is activated, all connected smoke detectors will alarm; Using Remote Controllerto do weekly test and mute sound if faulty warning or check low battery or Interlink wireless smoke detectors make them connected to each other. Wireless technology with a transmission range of over 100 m (under the open sky) sends and receives messages about fire hazards in the house using radio frequencies, so you get every extra life-saving second to escape. Featuring a relay function that extends transmission range, this radio-interlinked alarm can be interconnected with up to 24 smoke alarms to create a smart home network with no blind spots, even on different floors or in the basement and garage. Product Specification: Smoke sensor: Photoelectric Type: 433MHz Audible alarm:>85dB/3M Mode : RF Smoke detector Battery Package: DC 2*1.5V AA Alkaline (LR6,MN1500) or Carbon Zinc battery (R6P) Operation Current: <10uA (standby); <70mA (alarm) Alarm Volume: >85 dB(A) at 3 metersAlarm Sensitivity: 0.09 - 0.17 dB/m Low Battery: 2.6 ± 0.1 V Silence Time: Approx. 10 minutes Comply to Standard EN14604:2005/AC:2008 Premium Material: The smoke detector is housed in a flame-retardant, high-temperature resistant ABS material for enhanced quality, durability, and longevity.