Power up to three electrical devices with this Tripp Lite surge protector. When your circuits are compromised, the automatic shutoff feature safeguards your electronics. Use the two USB ports to keep your smartphone and other compatible devices charged without occupying the three-prong plugs. This Tripp Lite surge protector provides protection of up to 540 joules during a surge. | Tripp Lite | | Protect It! 3-Outlet Surge Protector | Black | Best Buy