Using a headphone jack plug you can protect the 3.5mm audio jack on your smartphone, but if you need to add more functions, the Pluggy Lock should be a nice solution.
The Pluggy Lock is a multi purposed headphone jack plug designed to add a reliable hook on your smartphone or tablet. As shown in the images, the headphone jack plug features simple and ultra compact design, and sports a unique rubber bumper in the center. When you screw the plug, the rubber bumper can be deformed into the earphone jack in order to steadily fix on the 3.5mm audio jack, and holding up to 7 lbs weight, while exposed ring allows you to attach lanyard, keychain, pendant, or stylus on your smartphone. When not in use, its included magnetic cap keeps the audio jack plug securely in place.
The team of Pluggy Lock is raiding via Kickstarter. Pledging $15 will let you own the versatile headphone jack plug. If you’re interested, jump to Kickstarter official site for more details or check out the following demo video first.