This tiny $40 device can make any pair of headphones wireless

The slow and eventual extinction of the headphone jack is a threatening prospect for your favorite wired headphones.

For many, the only option to use wired headphones with devices that don't have a headphone jack, like the iPhone 7, is to use an adapter. For many reasons, adapters aren't an elegant solution.

Thankfully, there are gadgets out there that will future-proof your wired headphones by essentially turning them into pseudo-wireless headphones, which plug into an external device so they can communicate wirelessly with your new, headphone jack-less devices.

One of the most promising gadgets is the Jack by Podo Labs. So far, it's raised over $600,000 on Kickstarter, despite setting its goal at a humble $20,000 - and there are still three days to go. 

Podo Labs sells the Jack for $30 on Kickstarter, and $40 at full retail price. That's much cheaper than buying a brand new pair of good wireless headphones.

Here's how Jack can future-proof your wired headphones: