Type-C to SPDIF Optical Audio Cable. Transmission: One-way from USB-C to SPDIF (SP-DIF → USB-C not supported). Why Choose Our Type-C to SPDIF Optical Audio Cable?. Length: 180cm. Unit Quantity: 5.9 feet Connector A: USB Standard Type A Male,USB Type-C Male Connector B: Coaxial Optical B,Toslink Optical Male Features: None,Digital Audio.