Etymotic Research ER89-2 etyBLU2 Wireless Bluetooth Headset Flexible boom with bi-directional microphone provides best-in-class speech clarity High-output 8mm moving coil driver offers best-in-class output level and sound quality Rejects 10 times more noise than cheekbone style wireless headsets Includes 4 ACCU, Fit noise-isolating eartips, USB charging cable, windscreen and 2-year warranty Option to upgrade to an Etymotic CUSTOM FIT earmold provided in box Includes 4 ACCU, Fit noise-isolating eartips, USB charging cable, windscreen and 2-year warrantyOption to upgrade to an Etymotic CUSTOM FIT earmold provided in box