It may not be the sexiest gadget on the market, but a reliable, speedy wireless router can improve your experience streaming movies, FaceTiming over Wi-Fi, downloading files, and more. “There are lots of low-cost router upgrades. It’s a good place to spend money,” says Michael Berk, executive editor of The Wirecutter. If you’re renting a modem (the device that talks to your internet service provider) or a combo modem-router, buy your own modem. “Your provider is charging you for one that is already out of date,” says Berk. (One caveat: If you’re served by fiber, this is not an option.) If you live in a large or multi-level house where Wi-Fi can be spotty, Berk suggests getting a mesh networking kit, which uses a “satellite” system that communicates across the home.