ZyXEL PLA491 is a HomePlug network extension device that integrates an Ethernet 4-port switch with a 4-AC outlet. The design enables networking between varied electrical devices. The PLA491 not only provides a high speed data rate via HomePlug AV technology but also supplies outlets to save space in a powerline networking environments. The PLA491 features four network filtered outlets The PLA491 isolates interference from the outlets via the onboard network filter, delivering clean and stable power for your powerline network. Use the ENCRYPT button to set up a secure connection between your PLA491 and another HomePlug AV product with an ENCRYPT button. Just push the ENCRYPT button on your PLA491, and set up your second PowerLine device within 120 seconds. Two independent on/off switches save power consumption when the network function is not needed. Just one touch, you can save energy easily.