... battery, 25 minutes fast charging;E, double track stereo, calls can be free to talk;F, volume ... compatible with iphone, ipad, notebook, computer, mobile phone bluetooth wireless connection;J, AVRCP remote control capabilities, the industry' ... highest wireless solutions, avoid interference with other Bluetooth signals. Specification: Bluetooth version: Bluetooth specification v2.1, compatiblev1.1, v1.2 ...