AT&T 4 Handset Cordless Phone 4 Handset Connect to Cell&trade; Answering System with Dual Caller ID Make and receive landline and cellular calls. Pair up to 4 cell phones with the base, 2 with CLP99453 or one cell phone or BLUETOOTH headset for use with landline calls Cell phone charging on the base unit - make and recive cellular calls while charging your compatible mobile phone at the same time Text, email, calendar, facebook, and twitter alerts from your cellphone for Android cell phones only Digital answering system Dual Caller ID/ Call Waiting Caller ID announce HD Audio Unsurpassed rangePush-To-Talk Full duplex handset and base speakerphone Extra large displays Backlit handset keypad and display 50 name and number phonebook directoryQuiet modeTable and Wall mountableUp to 14 minutes of digital recording timeBattery type-2.4V 400mAh Ni-MHCompatible with AT&T TL7600 Cordless Headset and TL80133 Cordless speakerphone