Casio PhoneMate technology recognizes and warns you when an online session, data transfer, or fax is in progress; a bright indicator light on the base and handset flashes. Built-in safeguards prevent you from interrupting the modem, even if you pick up the phone and try to make a call. You can, of course, override the safeguard to make a call. The CP-720 also indicates if the line is in use by another caller on an extension.

The CP-720 delivers the extended operating range expected of a 900 MHz phone. We tested this phone in a building with plenty of walls and electronic equipment; the signal remained strong at approximately 75 feet from the base, but quickly faded at greater distances. The sound quality was acceptable, though not as clear as some comparable 900 MHz phones. We also tested the battery and the CP-720 successfully delivered the four promised hours of talk time.

After one quick consultation with the instruction manual, programming speed-dial numbers was quick and easy. Additional features include call hold, call flash, last-number redial, handset pager, out-of-range alarm, and channel selection.

Uncommon features add to the CP-720's appeal and practicality. The handset keypad illuminates in low-light situations and you can extend the battery's standby charge for up to 20 days by turning on the power saver feature. You can take a call off hold by picking up any extension on the same phone line.

Pros:
Modem/phone line monitor Illuminated handset keypad Easy setup and programming

Cons:
Only 1 ringer-style option