Etymotic Research etyBLU Dual-Mode Noise-Isolating Bluetooth Headset Boom microphone with noise-cancelling technology is perfect for use in areas with high levels of background noise BLUmaxx quick-connect noise-cancelling microphone Up to 7 hours of talk time, and up to 100 hours of standby time Compliant with Bluetooth Core Specification 2.1, Headset 1.1 and Handsfree 1.5 profiles (supports Bluetooth 1.1 and later) Includes earloop, assorted eartips, filter changing tool with replacement filter, storage case, and USB charging cable