The Audio-Technica ATH-Sport 50BT portable Bluetooth wireless sports earphones have an isolating ear-insert design. These earphones are intended for use with Bluetooth enabled audio devices including cell phones and have a reception range of around 33 feet. They have a built-in microphone and integrated music player function and call connect/disconnect controls. The ATH-Sport 50BT is claimed by the manufacturer to be water resistant and comes with four pairs of isolating ear pieces in various sizes, three pair of non-isolating ear pieces in various sizes, a USB charging cable, and a carrying bag. It is covered by a 24-month warranty.