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After the product works normally, use a cloth or sponge with good water
absorption (prevent the echo of the ultrasonic waves) to completely wrap the
air inlet.
With an open ended paperclip, press and hold the CAL button for three
seconds, the top LED light will be on. After releasing the CAL button, place
the product on the table. After five seconds, the top LED light will flash. At
this time it is in the calibration mode. Wait for the LED to flash, the
calibration is over, and the product automatically enters the normal working
mode.
5.3 Best Practices for Wireless Communication
Wireless (RF) communication is susceptible to interference, distance, walls
and metal barriers. We recommend the following best practices for trouble
free wireless communication between both sensor packages and the console:
Electro-Magnetic Interference (EMI). Keep the console several feet away
from computer monitors and TVs.
Radio Frequency Interference (RFI). If you have other devices operating
on the same frequency band as your indoor and/or outdoor sensors and
experience intermittent communication between sensor package and console,
try turning off these other devices for troubleshooting purposes. You may
need to relocate the transmitters or receivers to avoid the interference and
establish reliable communication. The frequencies used by the sensors are one
of (depending on your location): 433, 868, or 915 MHz (915 MHz for United
States).
Line of Sight Rating. This device is rated at 150 meter line of sight (under
ideal circumstances; no interference, barriers or walls), but in most real-world
scenarios, including a wall or two, you will be able to go about 50 meter.
Metal Barriers. Radio frequency will not pass through metal barriers such as
aluminum siding or metal wall framing. If you have such metal barriers and
experience communication problems, you must change the placement of
sensor package and or console.
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