The Geemarc CL11 Telephone Ring Amplifier, amplifies your incoming telephone call to an amazing 95dB, this way you will never miss a call again Simply connect the CL11 in between the telephone and wall using the line provided and you are ready to go. The Geemarc CL11 Telephone Ring Amplifier, amplifies your incoming telephone call to an amazing 95dB, this way you will never miss a call again. Simply connect the CL11 in between the telephone and wall using the line provided and you are ready to go. For some telephone service providers including service and broadband, you might need to use an ADSL filter to operate CL11. You can have the CL11 set to high or low to suite your needs and there is a visual ring indicator which flashes when the phones rings to alert you further that your phone is ringing.
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