HV-900 Wireless Bluetooth Headset,Wireless Stereo Bluetooth Earphones with APTX , Noise Reduction , Echo Cancellation , Voice Guidance , Sweat-proof for iPhone 6 6 plus 5 5s 4 4s , Samsung Galaxy S5 S4 Note 3 4 and Other Smart Phones Bluetooth version 4.0 with A2DP Lightweight, yet very powerful Reduce noise,eliminate echo Flexible neck strap with memory function Vibration alert on call, Earphone battery display on smartphone