Bluedio DF610II is an awesome on-ear Bluetooth headphone made for those who like to enjoy music anytime, but don’t want to be bound by bunch of cable. DF610II Incorporate 2 pieces of 30mm neodymium dynamic drivers in conjunction with built-in maxim amplifier, deliver transparent and well-balanced sound, finest diaphragm provide 20-20kHz dynamic frequency response range, plus Music > EQ and tune your sound just the way you want.(setting of different device maybe vary), to enjoy the greatest sound effect with great headphone. Specification: Bluetooth Version: V3.0 Operating Distance: up to 10m(free space) Support: A2DP, AVRCP, HSP, HFP Music/talk time: up to 6 hrs Standby time: up to 160 hrs Frequency response: 20-20kHz Sensitivity: 105dB Total Harmonic Distortion(THD): <1%@1kHz Size: 150*140*40mm Weight: 69g Accessories: Bluedio DF610II BT headset x 1 USB charging cable x 1 User manual x 1