The first adaptor in this pack consists of a 200 Mbps powerline socket with a pass-through socket. In to this, you can connect an extension lead to power your router whilst ensuring your other mains devices retain a power source. An ethernet cable connects the powerline socket to the router to create a network over the mains wiring. Please note: networking components such as Powerline adapters require that all adapters must work within the same Home Plug standard to remain compatible, for example Home Plug AV (HPAV) adapters with communicate with other HPAV Powerline components, regardless of whether they are 200 Mbps or 500 Mbps. Older 85 Mbps adapters work on the different Home Plug 1.0 standard & are not compatible with Home Plug AV adapters. All Powerline products will connect to any switch or router Ethernet port. Powerline adapters can be used with extension leads (except surge protection ones), & will work across different ring mains so long as they share a common fuse box. For further information or advice, please contact us on solutions@ebuyer.com.