... --Hello upgrade version VOL Control --Match with our ROHS328A Base perform more well Noise Cancelling Radiation Proof Pulley Volume Control Rotro Handset ... suitable for most 3.5mm mobiles and computers, such as IPhone,IPad2, Samsung, HTC, BlackBerry, Nokia, MacBook and etc.2 ... handset for answering / hanging up, high quality speaker and microphone. 7. No batteries required, features a one-touch button ...