Brand: QVS. MPN: CC399C3. * Converts 3-ring 2.5mm into 3.5mm female port * Works with smartphone audio & mic headset applications Converts any audio port with 3-ring 2.5mm into 3.5mm female port. Specifically designed for smartphone audio & mic headset applications. (Connectors: 3.5mm Female to 2.5mm Male).