I found this thing in a parking lot, and took it apart and cleaned it up! It’s a Plantronics M25 Bluetooth Headset, and I was able to get it to pair with my iPhone 4S. I made a few calls with it, and it worked great! You can also play music through your phone with it, so I was able to stream Spotify straight to the earpiece!
They sell for around ~$30 on Amazon, and seem to be worth the price! As far as durability goes, it’s a solid 10/10!