Clarity XLC7BTHS Expansion HandsetExpansion handset for the Clarity XLC 3. 4+ Amplified Cordless Telephone Features Requires only AC power (no phone line). Will not function independently the XLC7BT or XLC3. 4+ cordless phone is REQUIRED. Hear clearly with amplification over 50 decibels and four (4) tone settings Amplifies outgoing speech up to 15 decibels for others to hear you better Loud and clear speakerphone for hands free conversations High contrast Caller ID screen with large