EOBP(TM) bluetooth 4.0 headphone business wireless stereo headset noise reduction with HD microphone earphone for cell phones (Black) this product uses the latest bluetooth v4.0 techology,and downward compatible with v3.0,v2.0,v1.1,internal integration of the RISC MCU and 80MIPS kalimba DSP 80MHz,and bluetooth 3 only the highest support to RISC MCU and 65MIPS KalimbaDSP 64MHz this product support profilse Support 1 bluetooth headset match 2 device: lets you connect two devices at once, so you can seamlessly switch between your business and personal phones. and won't miss any calls Wearing comfortable,noise reduction,with HD micphone(support single microphone) Support music player,low power consumption,voice prompt,voice report number,connect 2 active bluetooth device Pacage includeds:1*headphoen,1*charging cable,1*deputy headset,1*ear-hook,1*Manual,1*box