Reduces line noise that can cause data loss & keyboard errors.nn 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. All APC products comply with local agency safety requirements, including UL in North America & CE/ Kema/ Gost/C-tick/A-Tick/ Telepermit in their respective regions.nn Surge Arrest will warn you if its circuitry has been damaged by heavy strike or power line surge & it is unable to provide 100% protection. If still under warranty, APC will then replace your damaged Surge Arrest free of charge.\n\n\n\n Product ID: PM5-UK\n\n\n\n\n\n Model: Surge Arrest\n\n\n\n\n\n\n\n\n\n\n\n\n\n