Stereo Headphones Built-in BT: Stream Music CordlesslyBuilt-in Microphone: Answer Calls Hands-FreeWorks with SmartPhones, MP3 players, Notebooks and other BT-enabled devicesIPX8 Marine Grade Water Resistant ConstructionEasy to Use Push Button ControlsMP3 Control Unit Detaches for Charging Battery chargings via USB PortIdeal for Active SportsOne Size Fits All Headband StyleLED Light IndicatorsUp to 6 hour Battery LifeStandby Time: 20 hoursBT Version 2.1+ EDRBT Operation Range: 33 FeetTemperature Range: 32? F - 176? Fchargings via Mac/PC USB Port or 5V 1A USB Charging CordDimensions (W x H): 4.9" x 1.0"Sold as: UnitWeight: 0.45 lbs.Item Dimensions: 1.19" x 4.81" x 5.12"Item Weight: 0.23lbs