An amplifier is required if the telephone to which you are connecting does not already have a dedicated headset jack. The amplifier connects the telephone and the headset and offers additional capabilities, including volume control and mute. Any one of the amplifiers below will deliver precise levels of listening and talking comfort, superior protection, and excellent audio performance to your office telephone. Choose the one that is right for your needs. M22 Vista Telephone Headset Amplifier Availability: Usually ships the same business day. MSRP: $120.00Our Price: MX10 Headset Switcher Adapter Availability: Usually ships the same business day. MSRP: $150.00Our Price: P10 Plug Prong Adapter Availability: Usually ships the same business day. MSRP: $110.00Our Price: Universal Refurbished Amplifier M12 Availability: Usually ships the same business day. CA10 Cordless Telephone Headset Amplifier Availability: Usually ships the same business day. MSRP: $259.95Our Price: A20 Telephone Headset Amplifier & Accesory Deck Availability: Usually ships the same business day. MSRP: $149.95Our Price: Choose a link from this drop down box Amplifiers -M12 Vista Telephone Headset Amplifier -CA10 Cordless Telephone -MX10 Headset Switcher Adapter -A20 Telephone Headset Amplifier -P10 Plug Prong Adapter -S10 Telephone Headset System -T10 Headset Telephone -T20 Headset Telephone Headsets-Home & Office -Mirage H41 H41N -Supra H51 H51N H61 H61N -TriStar H81 H81N -Encore H91 H91N H101 H101N -H131N Freehand -DuoSet H141 H141N Cordless Phones Mobile Adapters Mobile Headsets M114 M124 M145 Computer Headsets Analog Computer Headsets Digital Accessories - Parts Low Priced Specials Refurbished Product 2 Year Warranty All product shipped within 24 hours - FREE OF CHARGE The Headset Guy PO Box 131791. Carlsbad, CA 92009 Phone: (888) 793-8976 ~ Fax: (702) 920-8640 This Web site is run by a distributor of Plantronics® products and is not otherwise affiliated with Plantronics®, Inc.