This phone is designed for people with moderate to severe hearing loss, Macular Degeneration, ARMD or who are visually impaired. The Dialogue XL-30 has oversized keypad buttons making dialing numbers easier. It has volume control up to 30 dB (30 times louder) which allows for loud and clear telephone calls. In addition, the Dialogue XL-30 has the following features: Tone Selector for adjusting sound clarity and distinguishing similar sounding words like "chair" and "share" Audio output jack for direct connection to assistive listening devices Handset is compatible with hearing aid T-coil 12 programmable memory dial buttons Adjustable super loud ringer and bright visual ring flasher Easy-to-see oversized keypad buttons Adjustable outgoing voice amplification (15 dB) so callers can hear you better Redial, hold and flash buttons