Sport exercise headphone, to free your hands, enjoying music and other audio when doing exercises! Highly compatible bluetooth 4.0, you can connect the headphone easily with your phone, with HD music play, or answer a call without holding your phone, microphone was also built-in the headset. Special magnet attached design was to stick 2 plugs together which prevents tangles. Light weight makes you easy to wear it even a long time. Product Model: A920BL Bluetooth Version:V4.0 Microphone:Support Noise ReductionSP, CVC6.0 Operating Frequency:2.4GHz Wearing Manner:In-ear Charging Time: about 1 hour Transmission Distance:5-10m Cable Length:1.968 feet Compatibility:Smartphones like iPhone,Samsung,Huawei,etc. Tablets like iPad, Samsung, etc.