This AT T 438 Caller ID Display Box is an essential tool for those still using dial-up internet. With features like 90 Name/Number Caller ID History, Call Waiting, Audible and Visual Call Alerting, Display Dial, Caller ID, Visual Message Waiting Indicator, and Memory Loss Protection, you'll never miss an important call while online. The installation process is quick and easy, and with its Dark Blue/Silver color and sleek design, it will look great in any home or office. This Caller ID Display Box is compatible with RJ-11 connectors and is brand new in the box. Whether you're a business owner or a home user, this device is a must-have for anyone using a dial-up connection.