Clarity W6500M The Clarity W6500M handset has an amplified receiver controlled by a rotary (thumb wheel) volume control. The Clarity W6500M provides added receiver volume in noisy surroundings and helps combat poor line quality. Plus, the Clarity W6500M is perfect for the hearing impaired. The amplifier of the Clarity W6500M includes a carbon compatible transmitter for clear transmission and is hearing aid compatible. The volume level on the Clarity W6500M is fixed until the thumb wheel is rotated. W6500M Features: W6 Handset, Amplified Receiver Controlled By A Rotary Volume Control, Carbon Compatible Transmitter For Clear Transmission, Hearing Aid Compatible