AT&T 993 2-Line - Manual (Page 11)

8
Getting started
Avoid placing the telephone too close to:
Communication devices such as: personal computers, computer routers,
television sets, VCRs, wireless routers (wireless broadband, wi-fi, or 802.)
or cordless telephones.
Excessive heat sources.
Noise sources such as a window with traffic outside, motors, microwave
ovens, refrigerators, or fluorescent lighting.
Excessive dust sources such as a workshop or garage.
Excessive moisture.
Extremely low temperature.
Mechanical vibration or shock such as on top of the washing machine or
work bench. •
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Telephone location
Choose a central location close to a telephone jack and an electrical outlet
not controlled by a wall switch. The telephone can be placed on a flat surface
or mounted on a standard wall plate.