Protects your phone or computer, laptops, home entertainments, TV, CD/DVD players, Hi-Fi systems, microwaves, refrigerators and all other electric system from damaging power surges for up to five electronic devices. 
The "Protected" indicator light turns blue to let you know your equipment is secure, the "Grounded" indicator light turns red to warn you when your outlet is not properly grounded, while the both indicators light turns ON to warn you when your outlet is not properly grounded and no surge protection.