Meet Plugfones: a pair of Bluetooth earplug headphones that let you block noises from the world around you and answer calls. They connect to your smartphone via Bluetooth. The battery life lasts up to 8 hours. You get a universal button to power the device on/off, play/pause, and answer calls.
Plugfones is sweat and water resistant. It is available in short and long models. More information is available on Indiegogo.