USB Type-C to 3.5mm headphone jack adapter. This is an analog type, meaning it does not contain a DAC (digital-to-analog converter) chip. Therefore, sound will only be output if your smartphone or tablet supports analog audio output from the USB-C port. Some older Android devices, etc., need to support "audio accessory mode." Many devices do not support analog output, so there is a possibility that sound will not be output or the device will not be recognized. Before purchasing, please confirm that your device supports "USB-C analog audio output." I mistakenly purchased this, so it has been opened, but it has only been used once. I cannot accept any claims after purchase, so please understand this before purchasing. It may take about a week for delivery. Thank you for your understanding. Thank you for viewing.