This phone with Digital Clarity Power™ and 50dB amplification, is the base for a comprehensive telephone and wake-up signaling system. (see pg 3 for phone details) Set the built-in alarm clock for your wake-up time and it will sound an audible alarm and activate a lamp flasher and/or bedshaker. The same signaling accessories will let you know when the phone is ringing. This is the only signaling system that includes a phone as the alarm clock base.