Youshiko YC9510, Руководство по эксплуатации

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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 or 100 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 100 feet or 30 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.
The following table3 shows different transmission media and expected
signal strength reductions. Each “wall” or obstruction decreases the
transmission range by the factor shown below.
Medium RF Signal Strength Reduction
Glass (untreated) 5-15%
Plastics 10-15%
Wood 10-40%
Brick 10-40%
Concrete 40-80%
Metal 90-100%
Table 3: RF Signal Strength reduction
5.5 Display Console
The front and back of the display console is shown in Figure 9 and Figure
10.