Product Description
Thus, buyers need to remind you: This product is installed in the door to use, if the outdoor temperature and the temperature close to or higher than 37 °, hot air through the sensing zone into the outside temperature is below 5 ° or more indoor time, will is sensed, this situation does not belong to false positives. Infrared induction principle: nature, any temperature above absolute – the object will have when IR (273 degrees), the temperature of different objects, the release of a wavelength infrared energy is not the same. Pyroelectric infrared sensor (PIR), which can change the wavelength of infrared signals between 8 to 12um into electrical signals, and is able to signal the nature of the white inhibited, and therefore the sensor area infrared detectors, when no body is moved, pyroelectric infrared sensors to sense the temperature of the background only when the body into the sensing zone, sensed by the Fresnel lens, pyroelectric infrared sensor body temperature is the temperature difference between signal and background Therefore, the basic concept of infrared detection of infrared detectors is sensing the difference moving objects and background object temperature.Purchase Notes
Products include
1x infrared sensor doorbell
1x US power
Products not include battery
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| Shipping Company |
Shipping Cost |
Estimated Delivery Time |
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3 - 7 days |
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3 - 7 days |
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5 - 14 days |
| Post Air Mail |
Free Shipping |
15 - 45 days |
| Return Policy |
If the product you receive is not as described or low quality, the seller promises that you may return it before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe) and receive a full refund. The return shipping fee will be paid by you. Or, you can choose to keep the product and agree the refund amount directly with the seller.
N.B.: If the seller provides the "Longer Protection" service on this product, you may ask for refund up to 15 days after order completion. |
| Seller Service |
On-time DeliveryIf you do not receive your purchase within 60 days, you can ask for a full refund before order completion (when you click "Confirm Order Received" or exceed confirmation timeframe). |
