User's Manual

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The product should be kept away from heat sources such as heaters, kitchen
stoves, etc. It should not be placed in rooms where the temperature is less than
5 °C (41 °F) or greater than 40°C (104 °F). Damp basements should also be
avoided.
The maximum calling distance may be shortened when the product is used in
the following places: Near obstacles such as hills, tunnels, underground, near
metal objects such as wire fences, etc.
Operating the product near electrical appliances may cause interference. Move
away from the electrical appliances.
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