Amplifies incoming sound up to 35dB DECT 6.0 Interface-free technology Patented Clarity Power technology Loud and clear speakerphone Adjustable tone control Large backlit keypad 10 loud-and-clear ringtones with six levels of volume Easy-to-read caller ID display Hearing aid compatible Includes belt clip and 2.5mm headset jack Enjoy clear and crisp sound Add on to Clarity E8 Series phone