The C4230HS is designed for use with the C4320 or C4220 cordless speakerphones. It will not function by itself. (see Related Products below)
Limit of three C4230HS units per system
Separate volume controls and 4 tone settings on the handset provide up to 50 decibels of amplification with Digital Clarity Power technology for improved understanding
Amplfied speakerphone in the handset with volume and 4 tone controls
High contrast LCD Caller ID display in the handset
5.8 MHz signal for clear reception
Hearing aid compatible - for increased clarity when using your hearing aid or CI telecoil (aka: telephone switch, t-coil, t-switch)
If you are using a DSL phone line, a second high frequency filter may need to be attached to the phone line to remove the background noise caused by the modem.