The Sony TC-WR745S is a wireless receiver designed to connect wireless audio devices to a home theater system or Audio/Video (A/V) receiver. It supports the latest Wireless Speaker & Audio (Wi-SA) standard for high-quality, low-latency wireless audio streaming with seamless synchronization between multiple speakers. It also works with traditional Bluetooth technology, making it flexible in its compatibility. Furthermore, it includes features like audio sync function, USB DAC support, and easy pairing with NFC (Near Field Communication).