This is a 2.5 mm 4 pole conversion cable. It cannot be used with regular 3.5mm plug earphones. This is an earphone jack conversion cable that allows you to play high quality sound on smartphones, computers, tablets, etc. with USB type C installed. [Built-in DAC System] We have paid attention to cable wires, and we use OFC for low frequency use in the center and a silver coat OFC for the outer periphery, to achieve high sound quality. Not compatible with balance connections. Not compatible with microphone input. Depending on the device you connect, the volume may be larger. When you first connect the earphones, turn down the volume and make sure it works. Depending on the device being connected, it may not work. Product specifications: PCM up to 384 kHz/32 bit; DSD not supported; Operating environment: Android 7.1 and above; Windows 10 or higher; Input terminal: USB Type C; Output terminal: 0.1 inch (2.5 mm) 4 poles; Weight: 0.4 oz (10.5 g); Length: 4.5 inches (115 mm) (± mm) (± mm) cable; Silver coated OFC