Mr.Pro Brand V4.1 Wireless Sweatproof Bluetooth Headphones Foldable Hi-fi Stereo Headsets with Noise Reduction Mic & Rechargeable Li Battery for iPhone 6s Plus Galaxy S and Android Phones (X1-BLUE) Stereo Bluetooth headset with back-hang style Foldable design provides maximum portability AUX line in allows music playback from various sources even when wireless option is not available Features Software & CVC echo/noise reduction for reducing noise Wirelessly enjoy stereo music from all A2DP-enabled devices, such mobile phones, PDA, PC etc Switch Frequency Response: 20 Hz - 20 KHz, Very high Signal to Noise Ratio (SNR):95 Db, Total The latest version of A2DP1.2 and AVRCP1.0 profiles supportSupports Bluetooth Headset and Hands-free Profile(HFP 1.5) RF Frequency Range: 2.402-2.480GHZ, 2.4G ISM band Radio Performance: Receive Sensitivity of -90dBm, TX Power Max 4dBm