RF connections, modems, and AC/DC power connections are also all examples of ports that can benefit from Littelfuse circuit protection. RF tuner ports can use the PolySwitch LVR devices or surface-mount devices to help with overcurrent protection, as well as PESD devices to help in overvoltage protection. Several Littelfuse components protect modem ports from any number of electrical mishaps: PolySwitch Telecom devices for overcurrent; and 2Pro Devices for integrated circuit protection. One of the oldest connector types, the AC port, can be protected from damage caused by overcurrent events using PolySwitch LVR devices. Barrel jacks can benefit from the integrated circuit protection that Littelfuse PolyZen devices help provide.