Sonero Premium Stereo Audio 3.5mm jack (4-pin) to 2x 3.5mm jack headset adapter Sonero Premium 3.5mm stereo jack audio adapter, for lossless audio transmission with perfect sound quality The Premium Audio Adapter from Sonero is specially designed to split a combined headset signal into separate headphone / microphone signals. The precision-fit connectors with chrome-plated aluminum plug have gold-plated contacts and guarantee an optimal connection with maximum transmission quality as well as durable corrosion protection.