Never mind having to waste time trying out all the bulbs on a Christmas tree light strand to find the one that's not working, if you're willing to spend a lot more money than you reasonably should on string lights you can buy a set that allows you to program a whole light show on your tree via your smartphone. Twinkly is a Wi-Fi enabled LED light string that you can control using your phone to change the lights' colors, create patterns and animations and synchronize the lights with music. You can even pair it with Google Assistant for voice activation. All that doesn't come cheap, with a single 175-light strand that's only enough to cover the front half of a six-foot tree selling on Amazon for $129.