In the Internet era, wearable devices have provided consumers with a more convenient lifestyle. True Wireless Stereo (TWS) headphones and smartwatches are gradually becoming popular, thanks to their compact size, which enables users to easily use them in any scenario. Since they are worn at all times, wearable devices also allow for continuous interaction between users and the devices, including direct or indirect interaction. The application of OCS products in wearable devices empowers products to explore more possibilities in the personal electronics field.