ECOWITT HP2551, Operation Manual

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5.6 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:

Indoor sensor placement:
The sensor will have the longest reach for its
signal when mounted or hung vertically. Avoid laying it down on a flat
surface.
 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 300 feet 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 100 feet.

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.
The following table shows different transmission media and expected signal
strength reductions. Each “wall” or obstruction decreases the transmission
range by the factor shown below.