K-Smoke Sensor เซ็นเซอร์ตรวจจับควันไร้สาย > Infrared photoelectric sensor > MCU processing, eliminate false alarm > Surface-mount device (SMD) circuit board design > High detection sensitivity > Simple ceiling installation using a dedicated bracket > Up to 3 years battery life using a 3.6V lithium battery > Low battery indication at least 30 days from warning signal > Alarm sound level 80dB at 3m(10 feet) > Frequency: 433MHz