Principle is based on electrical transformer, materials to be used: 2-double A battery and duct tape or electrical tape, disconnect ur line from router, make one roll of the utp wire to first battery and roll it with a tape then make 4 rolls to second battery and it must be no gap with the first one then roll up again with tape. The first battery must be on the router side and the second battery on the modem side. Plug it again to router and test for your speed.