More from Amazon.com : http://www.amazon.com/gp/product/B005E95AXY?tag=thefatkidin06-20
NEW In Line Amplifier Tone Control 40dB WH (Special Needs Products)
Compatible with most home office telephones
NEW In Line Amplifier Tone Control 40dB WH (Special Needs Products)
Compatible with most home office telephones
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Tech