Stereo Bluetooth headset with back-hang style Foldable design provides maximum portability</br>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 automatically from remote controls on the headset allow you to play</br>The latest version of A2DP1.2 and AVRCP1.0 profiles support Supports Bluetooth Headset and Hands-free Profile(HFP 1.5) RF Frequency Range: 2.402-2.480GHZ 2.4G ISM band</br>Radio Performance: Receive Sensitivity of -90dBm TX Power Max 4dBm</br>Frequency Response: 20 Hz - 20 KHz Very high Signal to Noise Ratio (SNR):95 Db Total</br></br>Product Description</br></br>SoundBot SB220 Bluetooth Headset Wireless Stereo Headphone for Music Streaming & Hands Free Calling w/ 20 hrs. Talk & Playtime 16 days Standby Time Built-in Mic A2DP AVRCP Noise Reduction Human Engineering Behind the Neck Frame Specification Bluetooth Specification v2.1+EDR class 2 The latest version of A2DP1.2 and AVRCP1.0 profiles support Supports 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 Frequency Response: 20 Hz - 20 KHz?? Very high Signal to Noise Ratio (SNR):9