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Please read the Operating Instructions booklet to learn more about the advanced features of the Q90D. Quick Guide Ameriphone products are manufactured by Clarity®, a Division of Plantronics, Inc. 4289 Bonny Oaks Dr., Ste. 106, Chattanooga,TN 37406 VOICE (800) 426-3738 TTY (800) 772-2889 © 2004 Plantronics, Inc. 79040.000 B2/04. Installing and Using Your Q90D Installing and Using Your Q90D Setting Up Your Q90D Lock Switch 1. Slide the LOCK switch (which is located on the right side of the unit be