Review on Sony WH-CH510 Wireless Bluetooth On-Ear Headset with Mic for Phone Calls - Blue by Amrit Barla ᠌

There is a non-switchable transparency mode while using the hands free ears. As for the sound . It goes 20-20k => sounds merge like in noise, there is no purity of sound, but good volume and rolling (?) of bass from the box, without buildup. Suitable for swotting. And if you don't need a headset mode and like a good pressure to your head - take better audio equipment ( AUDIO-TECHNICA ATH-S200BTBRD ). There, although the codec is only SBC, the instrumental is awesome. The sound there may be quiet from the box, but they will swing + good sound insulation, better than here.