Corded/cordless answering system uses Bluetooth technology to let you make and receive calls from your cellular plan and landline while enjoying the comforts of a home phone system - with or without a landline. Built-in USB dock means you can make and receive cellular calls from your home system while charging two compatible mobile phones at the same time. Downloadable phonebook directory stores up to 6,000 cellular phonebook entries on the cordless handsets. Know when your Android mobile phone receives a text, e-mail, calendar reminder or social media update with mobile notifications. Virtual multiline operation connects up to two cellular lines and two landlines to provide the freedom to make and receive calls on all four lines at once. ECO mode manages power consumption so the system uses less energy and you get the best battery life. High-contrast black text on the cordless handset makes it easy to read incoming caller information or call history records.