Clearsounds Amplified Cordless Extra Handset A50E Amplification up to 50dB; Caller ID / Call waiting with Caller ID UltraClear tone control to shape both high and low frequencies; Large Caller ID display Vibrating alert in handset and extra loud ringer in base and handset; Amplified 2.5 mm headset jack Jack for Optional Vibrating Pad; Back lit key pad Hearing aid compatible; 1 Year Manufacturers Warranty