Mitel NETVISION PHONE - Manual (Page 7)

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IMPORTANT INFORMATION ABOUT WIRELESS
PHONES
Wireless telephones use radio frequencies, which are susceptible to
interference from electrical devices such as motors, computers, VHF radios,
and fluorescent lights. Such interference can limit the operating range of the
telephone and cause noisy or interrupted reception. Walls, building wiring,
and metal structures such as filing cabinets can also affect the performance
of the telephone.