Clarity XLC3.5 HS Severe Hearing Loss Cordless Handset (2-Pack) Hearing Aid Compatible XLC3.5 HS DECT 6.0 Technology 1.9GHz Extra Handsets Extra Handset Only Works With: Clarity XLC3.4 Amplified Volume - Up To 50dB & Amplified Ringer - Up To 95dB Big Button Illuminated Talking Keypad