. Lightning & power surges can permanently ruin your electronic equipment. Changes in voltage cause lockups & loss of work. This unit will protect your equipment from the threat of bad power. The Essential Surge Arrest series offers a great value for home equipment & business applications such as small office/home computers Key Product Info. IEEE let-through ratings & regulatory agency compliance Lightning & surge protection Noise filtering Building wiring fault indicator Fail safe mode Catastrophic event protection Data-line protection Product Features IEEE let-through ratings & regulatory agency compliance APC surge protectors undergo stringent testing by IEEE & are awarded let-through ratings which indicate the maximum voltage level that can possibly reach your equipment after a surge or voltage spike has passed through an electric surge protector. Lower IEEE let-through ratings indicate better protection & performance. The APC Essential Surge Arrest series offers optimal performance with a let-through rating of less than 330V for North American products & a rating of less than 15% for products sold worldwide. Lightning & surge protection To prevent damage to your equipment from electric power surges & spikes. Noise filtering Attenuates EMI/RFI line noise that can cause data errors & keyboard lockups ensuring better performance of protected equipment. Building wiring fault indicator This LED informs users of potentially dangerous wiring problems in the wall circuit. Fail safe mode Most other surge suppressors continue to let power through even after their circuits have been damaged leaving your equipment exposed to future surges. APC's Surge Arrest fail safe which means that once the circuit of an APC Surge Arrest has been compromised the unit disconnects equipment from the power supply ensuring that no damaging surges reach your equipment. Catastrophic event protection Surge Arrest components such as MOVs & Thermal fuse ensure instantaneous reaction to lightning strikes & wiring faults. If the surge components are damaged due to power spike or over voltage excess power cannot reach your equipment. Unlike the APC Surge Arrest products most surge suppressors continue to let power through even after circuits have been damaged leaving your equipment exposed to other damaging surges. Data-line protection Protection of data lines (Ethernet Coaxial & Phone lines) ensures complete protection of your equipment from surges. It is very important to protect your equipment from back door electric surges traveling through data lines as they can be as damaging to your equipment as surges traveling over power lines. What's in the box?. User Manual