Hearing aid compatibleAdjustable receiving volume: up to 50dB with boostAdjustable receiving tone /- 10dB (4 levels)1 direct memoryHands-free speaker phone (5 volume levels available)Phonebook with up to 150 numbers Redial, pause, flash, muteKey lock settingContinuous talk time: 8 hoursTalking Caller ID* and talking keypadChoice of 16 languagesVisual incoming call indicator Ringer volume: 80dB (handset) and 70dB (base) 5 melodies plus 5 polyphonic melodies