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The LEDs inside the photelectric smoke alarms are low power (less than a TV remote-control) and very little infrared escapes from the detector (because the detection chamber is shaped to exclude light, and is all black inside).
The LEDs inside the smoke alarms are low power (less than a TV remote-control) and very little infrared escapes from the detector (because the detection chamber is shaped to exclude light, and is all black inside).
The LEDs inside the photelectric smoke alarms are low power (less than a TV remote-control) and very little infrared escapes from the detector (because the detection chamber is shaped to exclude light, and is all black inside).
The LEDs inside the smoke alarms are low power (less than a TV remote-control) and very little infrared escapes from the detector (because the detection chamber is shaped to exclude light, and is all black inside).
