... -in lithium battery -volume control buttons - Bluetooth v2.1 Flower design Bluetooth wireless headset for iphone A, play, pause functions;B, personalized ... lithium battery, 25 minutes fast charging;E, double track stereo, calls can be free to talk;F, volume control ... , avoid duplication of wireless connection to code;H, support for bluetooth V2.1 standard version, backward compatibility V1.1, V1. ...