NU Technology NU-BTH(BH03)02 Wireless Bluetooth 3.0 Earphones, Black (Discontinued by Manufacturer) Echo cancellation & noise deduction technology Embedded microphone design Embedded long playback battery with 22 hrs. play/talk time and 370 hrs. standby time Compatible with iPhone 3GS/4/4S/ iPad2/iPod Mini and most mobile phones with Bluetooth function Ergonomic bendable design