awei smart business earphone mono bluetooth csr4.1 headset voice prompt wireless earbuds hifi stereo headphone wth mic ing

model:a830bl 1. ear hook, easy to wear; 2. talk and music auto switch, forward / back selection, play /pause ;3. excellent stereo music, super rock bass, call clarity; 4. support one connect two devices, call blocking function; 5. support voice prompt (english); 6. low power consumption, long endurance; 7. 5.1 channel, stereo surround; 8. protocol support: hsp/hfp/a2dp/avrcp ;9. support iso system power display ;10. color: grey/gold ;11. retail package :18*10*3cm