Bluedio DF610II On-ear Bluetooth Stereo Headphones with Built-in Microphone - White For those who like enjoy music anytime. Incorporate 2 pieces of 30mm neodymium dynamic drivers, deliver transparent and well-balanced sound, 20-20kHz dynamic frequency response range. Connect with 2 phones or tablets simultaneously, offer steady Bluetooth signal, not easy dropout no matter doing exercise, going outdoor or lying in your living room. Design of DF610II is simplicity, tiny, lightweight with 69g only and stretchable headband to fit your head, so as good stuff of gym and morning exercise. Sound isolating memory foam ear pads blocks some noise before reach to your ears, and provide unrivalled wearing comfort. Incredible 6 hours playtime and 160 hours standby time for a single charge, plus intuitive operation, accompany you for whole day journey.