The APC Professional 7 Outlet SurgeArrest Power Strip with RJ-11is suitable for Home or Office Computers and Electronic Equipment. Lightning and power surges can permanently ruin your electronic equipment. Changes in voltage cause lockups and loss of work. This unit will protect your equipment from the threat of bad power. The Professional SurgeArrest series offers a great value for high-end home equipment and business applications such as small office/home office computers, high-performance stereo equipment, laser printers and modems.