Product Details:
5.8 Ghz 2 Line Expandable Digital Cordless Answering System Features: Call Waiting Caller ID shown on handset (where available; requires subscription from your local phone service provider)
Voice Enhancer Technology (adds lost frequencies back to voices)
2-line operation
5.8 GHz digital spread spectrum operation
multi-handset operation (add up to 7 optional handsets for a total of 8)
built-in digital answering machine with up to 60 minutes total record time
3-line backlit LCD display on handset
Chain Dial ? link programmed numbers together (such as calling cards) for one-touch dialing
50-entry phone directory
50-entry Caller ID memory
handset speakerphone
base speakerphone
4-way conferencing (between handset, base unit and 2 outside lines)
NiMH rechargeable battery (up to 5 hours of talk time per charge