... high quality, Breakthrough innovation Best of Innovations Hello anti-radiation Pulley Volume Control HandsetDimension: 3.5*2*22cmConnector ... for: ALL 3.5mm mobile phone and computersFunction: Anti-radiation,Volume control, Noise reduction system, keep the ... :Digital noise reduction technology,Build-in the RPU system anti-radiationcircuit board, Volume ControlUse for: home, travel, office, gifts ...