The Clarity Ameriphone XL30 amplified telephone is designed for people with moderate to severe hearing loss Volume control up to 30 dB, for loud and clear telephone calls 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