Clarity Walker W10-Ivory (Ivory color) – AC POWERED INLINE AMPLIFIER FEATURES: – Easily Installs Between Existing Telephone Base and Current handset – Portable for Travel – Rotary Volume Control (Thumb Wheel) – Improves Listening Volume Up to 20 Decibels – Boosts Receiver Volume 3X Normal Electronic or Standard Phone – Compatible (Telephone Dial Pad Must be in the Base) – Perfect for Hearing Impaired – Includes AC Adapter