The keyless car is a marvel of engineering. But how is it that they can start even when the battery in your key fob goes dead? The answer lies in science.

UGreen makes pairing your wireless headphones to the transmitter incredibly easy. You hold down the pairing button for three ... trips and one bicoastal trip. Battery life also holds up well ...

And the transmitter for that signal is ... all you have to do is physically put your dead-battery fob in a designated location, and the button will still work. If you're wondering how on earth ...