Chin bar headphones wireless headphones bluetooth headphones neodymium magnet bluethooth 21 edr bluetooth profile a2dp avrcp hsp hfp audio codecs sbc faststream range 10m 180 mah lithium ion battery charging time 2hrs battery life music 75hrs phone 85hrs compatibility ipad iphone ipod via creative bt d5 optional type of fitting in ear transmission mode cordless features microphone bluetooth impedance 32 ohm frequency response 20 20000