If you need rugged, wireless headphones with a built-in microphone for hands-free call functionality, you need the US$69.95 DJ Slims from Outdoor Tech (www.outdoortech.com).
The slim shape helps the headphones stay in place on your noggin. And they sport the same rugged, rubberized finish as other OT products.
The DJ Slims wirelessly connect with your smartphone, tablet, laptop, or any other Bluetooth-enabled device. They stream clear audio for up to 30 feet and last nine hours on a single battery charge. As mentioned, the built-in microphone allows you to make and receive hands-free calls.