JK Wireless Handsfree Bluetooth Music Stereo HM7000 Headset Headphone Compatible with Samsung Galaxy S3 S4 i9300 i9500 Note 2 Phone-Retail Packaging (White) HD high definition dual microphone noise reduction Support any key answer, effectively connected with the smart phone, automatic pairing connection program, charging stay connected Voice recognition through intelligent control chip frequency, resulting in a reverse signal to filter out external noise within the frequency range of non-human sound Talk time: 7 hours standby time: 6 days