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If the plug does not fit fully in the outlet, reverse the plug. If it still does not fit, contact a qualified electrician to install the proper outlet. Do not change the plug in any way. 2. Plug-in the doorbell chime. Chime Volume Control 1. Set the chime volume on the back of the plug-in chime, if desired. 3. Before mounting, test the doorbell range. Plug-in the chime where you want to mount it and temporarily place the doorbell button on the doorjamb. Press the doorbell button. Access Door Ope