The MUHSMF1M 4-Pole 3.5mm headset extension cable (1m) features a 3.5mm (1/8\" TRRS) audio connector on one end and a 3.5mm (1/8\" TRRS) audio connector on the other, making it easy to extend the reach between your hands-free headset or headphones, and your iPhone, mobile phone or laptop computer. To ensure long-lasting performance, this high quality 3.5mm audio extension cable features molded PVC strain relief at each of the 1/8\" TRRS connectors, which prevents the cable termination points from bending at sharp angles, in turn reducing the risk of cable damage. To ensure proper hardware detection, it\'s recommended that the external headset be plugged into the adapter first, before the adapter is connected to the computer or mobile device.