78Radio frequencies used by the wirelesscardThe accessory wireless card and the optional wireless card (ET-CDWL1 series)operate on electronic frequencies within the 2.4 GHz band. You do not need a radiolicence in order to use a wireless card, but you should make sure that youunderstand the following points before using such cards.Do not use the cards near other sources of radioemissions.The following devices may use the same frequencies that are used by thewireless card. If the wireless card is used near such devices, radiointerference may prevent successful communication, or it may result inslower communication speeds being achieved.• Industrial, scientific, medical equipment, etc• Electric stoves, etc• Built-in radio devices used for identifying moving equipment in industrialproduction lines• Certain low-power radio devicesKeep the wireless card as far away as possiblefrom devices such as mobile telephones, TVs andradios when using such devicesDevices such as mobile telephones, TVs and radios use differentfrequencies from the wireless card, so that there will be no effect on eitherwireless card communication or on reception or transmission for suchdevices. However, radio emissions from the wireless card may cause videoor audio interference.Radio emissions from the wireless card will nottravel through steel framework, metal sheets orconcrete.The radio emissions from the wireless card will pass through materials suchas wood and glass (except for glass which is reinforced with metal fibres), sothat communication is possible because the signals can pass through wallsand floors which are made from these materials. However, the radioemission cannot pass through materials such as steel frames, metal sheetsand concrete, so that communication is not possible because the signalscannot pass through walls and floors which are made from such materials.
