HiCool X19C Bluetooth 4.1 Neckband Headset Built in Mic with Noise Cancellation High-quality sound: latest wireless Bluetooth 4.1 technology with A2DP stereo tech, provides high-fidelity stereo music and clear speech Comfortable neckband designed: featuring an unique flexible, lightweight & comfortable neckband designed Noise cancellation technology: exceptional audio with noise suppression and echo cancellation Android & IOS compatibility: the latest headphones can easily and quickly compatible with all android and IOS devices