Yingnuost Earphone Noise Cancelling Universal Stereo Earbuds Sport Mini Series Working distance 10 meters; Supports A2DP / HFP / HSP / AVRCP protocol; Support iphone and other parts of the phone The one with two functions simultaneously connect two devices 5-6 hours of continuous talk, listening to music 4-5 hours, standby 120-150 hours lossless sound transmission to ensure perfect sound quality.