Features: *Low profile keypad with protection ridge * Software upgradeable * Low battery warning *Mute indication *Polarity indication * Easy to use ? Tone and pulse * Two-way hands-free speakerphone * One-way amplified speaker phone mode (optional) *Amplified speaker *Last number redial ? Over voltage protection *Over current protection *Mute * PBX pause button * Audible ringer *Speed dialing *Volume control levels *Line and battery powered  *Passive monitor * Hearing aid compatible