The APC PNOTEPROC6 Essential SurgeArrest Notebook Pro protects the AC line for notebook computers, fax, and answering machine and also the phone lines! The APC PNOTEPROC6 reduces line noise that can cause data loss and keyboard errors through EMI and RFI noise filtering. The SurgeArrest will warn you if its circuitry has been damaged by heavy strike or power line surge and if it is unable to provide 100% protection. Additionally, APC's SurgeArrest is fail safe, which means that once the circuit of an APC SurgeArrest has been compromised the unit disconnects equipment from the power supply ensuring that no damaging surges reach your equipment.