Flexible and foldable design. 8 hours battery life Clear sound when taking phone calls or listening to music Connectivity - 3.5 mm headphone connector Features bluetooth version 4.2. Bluetooth range is 0.39 inch Troubleshoot-sound echoes during a call, adjust the volume by pressing the Volume button or move to another area. Drops in volume or noise depending on the connected device volume. To avoid this, appropriately adjust the connected deviceƒ??s sound